It depends what you like in a tennis string but I personally like babolat revenge polyester string.
Babolat.
Wilson or head or babolat
One Babolat tennis bag that holds 12 racquets is the Aero Racquet Holder; another is the Team Racquet Holder; and finally the Club Line Racquet Holder. These are the largest bags Babolat makes.
Babolat is a French sports equipment manufacturer that produces strings and tennis racquets for tennis, badminton and squash. Famous sportsmen like Roddick, Nadal or Clijsters use their racquets.
Babolat is by far the best trust me they have a wide variety of rackets to suit every style of play BABOLAT IS THE BEST!
For ease, you can purchase a string meter or any other string tension meter that measures it for you. All you need to do is clip it between the strings and it will read the number in the display. If not, you can always use your hand and lightly tap the string bed to get an rough est. The harder it is the higher the tension and vice versa.
This question comes down to peoples opinions. Though they are one of the most successful tennis brand. I use a babolat racquet similar to the one Rafa Nadal uses and in my opinion they are the best in their field.
there is a link. it tells u all the different strings. it also explains the string tension
Babolat Extra Sweet spot. Rs.5000 and it does not need Shock absorb. I think this is cheapest and best in Babolat.
I have found Babolat Syntec tapes, no Latex
Wilson BLX or Babolat Aero Pro drive