"Functional" Racket design guidelines for the (ITTF) brainwashed, clueless & newbies
Weakside is backhand  & strongside is forehand for most "humans" (as in any racket sport). There are exceptions where opposite is true, in which case you can swap blade & rubbers in table below. . Playing style & strengths on weakside & strongside are also usually quite different for most players. Equal (or same level) weakside & strongside is a delusional fantasy (even for most pros in table tennis). This is just a general guideline & there are always inexplicable illogical exceptions to the rule. Sorry, but para has not been included as of yet, due to large number of classifications but you should get an idea based on guidelines here 
Playing Style Strongside Rubber Weakside Rubber Strongside  blade composition Weakside blade  Composition Blade head size range Most Suitable for Comments
2 winged looper, lobber (advanced to pro level)  Spinny inverted: Euro / Japanese type sponge spin type (anti like top sheet)  Spinny inverted: Euro / Japanese type sponge spin type (anti like top sheet)  Softer woods with  outer ALC like composite Softer woods with  inner ALC like composite 150 -160 mm Youth  Under 18,  Adults ages 18-40 All youth should start here but unless a player turns pro or close, the probability of success for an adult with this racket design is only like 10% (though 90% delude themselves or brainwashed into believing the opposite). Comments about boosting beyond scope here.
2 winged looper, lobber (intermediate & below) Spinny inverted: Euro / Japanese type sponge spin type (anti like top sheet)  spinny inverted : Chinese style top sheet spin type  Softer woods with  outer ALC like composite Softer woods with  inner ALC like composite 150 -160 mm Youth  Under 18,  Adults ages 18-40 Either strong or weak side could be using  either Chinese or (Japanese / European) type rubbers as the skill level & technique develops towards advanced & beyond to identify rubber type difference 
Combo 2 wing attack Short Pips Spinny inverted Harder woods with  outer ZLC like composite Softer woods with  ALC like composite 150 -160 mm Adults ages 18-40 Theoretically almost perfect racket design but very few players , especially shakehand can succeed,  with this racket design unless you are like Liu Guoliang or Mattias Falck 
Combo 2 wing attack Spinny inverted low friction Super Long Pips to medium pips with sponge Softer woods with  ALC like composite Harder woods with  ZLC like composite 155 -160 mm Adults ages 18-40,  Masters age 40+  If you are incorrectly using short pips on weakside, this is the correct alternative. Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC
All round loop & block Spinny inverted low friction Super Long Pips no sponge (OX) Softer woods with  ALC like composite Softer All wood  155-165 mm Adults ages 18-40,  Masters age 40+  If you are incorrectly using short pips on weakside, this is the correct alternative. Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC
All round block & smash Short / Medium Pips low friction Super Long Pips OX Harder woods with  outer ZLC like composite Softer All wood  160-170 mm Mostly Masters age 40+ If you are incorrectly using short pips on weakside, this is the correct alternative. Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC
Modern loop defender (Pro or close USATT 2200+)  Spinny inverted high  friction Super Long Pips  with sponge Softer woods with  or without inner  ALC like composite Softer All wood  170-175 mm Adults age 18-40 Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC. Using super large blades is also mission critical
Modern chop & smash defender (Pro or close USATT 2200+)  Short / Medium Pips with sponge high  friction Super Long Pips  with sponge Harder woods with  ZLC like composite Softer All wood  170-175 mm Adult 18-40 & Masters 40+ Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC. Using super large blades is also mission critical
Modern loop defender (Amateur) Spinny inverted high  friction Super Long Pips  without sponge  (OX) Softer woods with  or without ALC like composite Softer All wood  170-175 mm Adult age 18-40 Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC. Using super large blades is also mission critical
Modern chop & smash defender (Amateur) Short / Medium Pips with sponge high  friction Super Long Pips  without sponge  (OX) Harder woods with  ZLC like composite Softer All wood  170-175 mm Adults ages 18-40,  Masters age 40+  Only use super long pips & not the low aspect ratio low pip density so called long pips listed on iTTF LARC. Using super large blades is also mission critical
Defensive all round Spinny inverted Defensive Medium Pips with sponge Softer woods with  ALC like composite Softer All wood  155-165 mm Adults ages 18-40,  Masters age 40+  Defensive medium pips are usually listed as long pips on ITTF LARC
Attacking All round Attack Medium Pips with sponge Spinny inverted Harder woods with  ZLC like composite Softer woods with  ALC like composite 155-165 mm Adults ages 18-40,  Masters age 40+  Attack medium pips are usually listed as short pips on ITTF LARC
Classic (Passive) Chop defender Anti or anti like spinny inverted (Japanese / Euro) high  friction Super Long Pips  without sponge  (OX) Softer All wood  Softer All wood  170-175 mm Mostly Masters age 40+ This may be suitable for older players who cannot loop of forehand for health or other reasons or who never learned to llop in their youth
Classic (passive) block defender Anti or anti like spinny inverted (Japanese / Euro) low  friction Super Long Pips  without sponge  (OX) Softer All wood  Softer All wood  160-170 mm Mostly Masters age 40+ This may be suitable for older players who cannot loop of forehand for health or other reasons or who never learned to llop in their youth
Blocking (at the table) Twiddle oriented play Spinny inverted Low friction Super Long Pips (OX) Softer woods with  or without ALC like composite Softer All wood  160-165 mm Adults ages 18-40,  Mostly Masters age 40+ 
Choppingg (away from the table) Twiddle oriented play Spinny inverted High friction Super Long Pips (OX) Softer woods with  or without ALC like composite Softer All wood  160-165 mm Adults ages 18-40,  Mostly Masters age 40+ 
TPG (Traditional Penhold Grip) Looper Spinny inverted No sponge (OX) super pips if never used  Same as shakehand cases above Softer All wood  150-160 mm All ages
TPG (Traditional Penhold Grip) Hitter Short pips No sponge (OX) super pips if never used  Same as shakehand cases above Softer All wood  150-160 mm All ages
HPG (Hybrid Penhold Grip) Hitter (twiddler) Short Pips Spinny inverted Harder woods with  outer ZLC like composite Softer woods with  or without ALC like composite 150-160 mm All ages This is the style played by Liu Guoliang
HPG (Hybrid Penhold Grip) Modern Defender Spinny inverted High friction Super Long Pips (OX) Softer woods with  or without ALC like composite Softer All wood  150-165 mm All ages
HPG (Hybrid Penhold Grip) All round (twiddler) Spinny inverted Any Super Long Pips (OX) or medium pips with sponge Softer woods with  or without ALC like composite Softer All wood  150-165 mm All ages
RPG (Reverse Penhold Grip) 2 wing looper Spinny inverted Spinny inverted Harder woods with  outer ZLC like composite Softer woods with  or without ALC like composite 150-160 mm All ages This is the style played by Wang Hao & Xu Xin
American Grip Looper (Twiddler) Spinny inverted low friction Super Long Pips no sponge (OX) Softer woods with  or without ALC like composite Softer woods with  or without ALC like composite 150-160 mm All ages This is the style similar to (but different weakside) played by Danny Seemiller & Eric Boggan (Anti is uselss on weakside unless you are as good as Eric Boggan) 
American Grip Hitter (Twiddler) High friction Short Pips low friction Super Long Pips no sponge (OX) Harder woods with  outer ZLC like composite Softer woods with  or without ALC like composite 150-160 mm All ages This is the style similar to (but different weakside) played by Danny Seemiller & Eric Boggan (Anti is uselss on weakside unless you are as good as Eric Boggan) 
  Most useless racket designs   
Any style Long Pips listed on ITTF LARC  Any rubber type Any Any Any Don't use Absolutely do NOT use any long pips listed on ITTF LARC as they are TOTALLY useless in the 40+ plastic ball era. This is complete fraud by ITTF. Please only use Super long pips. It is OK to use Medium Pips as shown above
Any style Any rubber type Long Pips listed on ITTF LARC (excluding some medium pips) Any Any Any Don't use Absolutely do NOT use any long pips listed on ITTF LARC as they are TOTALLY useless in the 40+ plastic ball era. This is complete fraud by ITTF. Please only use Super long pips. It is OK to use Medium Pips as shown above
Any style Any rubber type Short pips (including those that may qualify as medium pips) _ _ _ Don't use A racket with short pips on weakside is absolutely the most useless racket design, especially for amateurs. Too many historical, sociological  & technical reasons for making this seemingly VERY controversial claim. Biggest reason however as to why players fall for this is because short pips can seemingly do a little bit of everything & manufacturers want to sell rubbers .Visit this webpage for more information  https://ioctt.com/kg/s7.htm
Any style Any rubber type Anti Any Any Any Don't use Same reasonings , historical, sociological  & technical apply just as short pips but probably not as bad as short pips but still very bad
Any style Hardbat (OX or short pips with no sponge)  Hardbat (OX or short pips with no sponge)  Any Any Any Don't use Don't waste your time. Too many historical, sociological  & technical reasons . Beyond scope of discussion here
Any style Sandpaper Sandpaper Any Any Any Don't use Don't waste your time. Too many historical, sociological  & technical reasons . Beyond scope of discussion here
Modern (chop) defender _ Low friction Pips (Any type) _ _ _ Don't use So many clueless players think  frictionless type rubbers like Tibhar Dtec OX  can be used for chopping.  Joo Sae Hyuk can get away with using it despite it being useless but nobody is Joo Sae Hyuk
Modern (chop) defender _ _ _ _ Blades less than head size 170 mm  Don't use Blades with head size  less than 170 mm are useless for chopping as they do nt produce enough dwell time for maximizing back spin
Close to table block  defender Spinny inverted High  friction Pips (Any type) _ _ _ Don't use Don't use high friction rubbers like Feint or Feint Long etc if you are close to the table block defender. Use ONLY  low friction super long pips
 Twiddle oriented play Spinny inverted anti _ _ _ Don't use This is the worst combo because of lowest spin contrast between two sides of the racket. Both short pips & anti sit towards the dead center f the spin continuum preventing you from to maximizing your spin contrast & other variables for best twiddling
 Twiddle oriented play Spinny inverted Short pips _ _ _ Don't use This is the worst combo because of lowest spin contrast between two sides of the racket. Both short pips & anti sit towards the dead center f the spin continuum preventing you from to maximizing your spin contrast & other variables for best twiddling
 Twiddle oriented play Short pips (or anti) Anti (or short pips) _ _ _ Don't use This is the worst combo because of lowest spin contrast between two sides of the racket. Both short pips & anti sit towards the dead center f the spin continuum preventing you from to maximizing your spin contrast & other variables for best twiddling
American Grip _ Anti (or short pips) _ _ _ Don't use This is the worst combo because of lowest spin contrast between two sides of the racket. Both short pips & anti sit towards the dead center f the spin continuum preventing you from to maximizing your spin contrast & other variables for best twiddling. Only use super long pips on weakside