Best Strings for Intermediate Players

What are the best tennis strings for intermediate tennis players? Are polyester strings good for beginners? Is syngut good for NTRP 3.5? Is multifilament good for USTA 3.0?
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//STRINGS:
Grapplesnake USA: invi.tt/AKZQ
Toroline (TENNCOM for 20% off): toroline.refr.c...
ReString ZERO (TENNCOM10 for 10% off): shoprestring.c...
//GEAR:
Geau Sports: geausport.com/...
SwingVision: swing.tennis/r...
Katana Sports Copper Tape (TENNCOM1 for 10% off ): katana-sportz.com
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*Grapplesnake USA only ships to the USA, Canada, Australia, New Zealand and Mexico. Cannot ship to Europe or Asia unfortunately.
**Regular priced racquet must be valued at $175 CAD or higher.