Loose's string tension give more repulsion...and more powerfull smash....but hard to control... Higher's string tension give more tough...and more to control....but hard to smash and even reduce the power of smash... LOOSE TENSION: Smash Power-9/10 Control -5/10 HIGER TENSION: Smash Power-5/10 Control -9/10 Any Suggestion in racquet's string tension can do smash power(7/10)...Control(7/10).. Or shall i say perfect in all round....smash power & control....
Actually u are asking for an impossible answer....there's definitely no perfect string tension to suit everyone...coz everyone's racquet, stiffness, balance is different...not to mention, string thickness, hard or soft feeling and also your own standard of play, u maybe more wristy player or watever....juz see every Professional's string thickness and tension is all different... so how to say which tension is the best? I suggest u try out urself to find the tension that suits u and ur racquet well