what is the best kind of strings for power and durability?

You would probably want Yonex Nanogy 98 or 95 then. NBG98 is the more repulsive of the two, and both are nanocoated for improved durability.

I would not consider BG65Ti to be among the more repulsive strings, though durability wise it obviously lasts longer than the thinner strings.

 

Yonex NBG-95 and BG-65Ti both last ages and NbG-98 lasts a fair while. Ashaway Flex micro and Rally 20 are also very long lasting.

 

Of all the strings i've used, nothing has ever come close to bg-70 ti in durability.

 

NBG98 is the most repulsive of the three. It's also the most expensive of the three, because you can't have power, durability, and price all at once.

 

Bg 70 Pro is also my guess. NBG98 comes in second. NBG lacks a bit of feel imo, while BG70 keeps it a bit more.

 

you can try bg65 at higher tension.

 

NBG95 lasts pretty long. BG65Ti lasts freakishly long (my friend had that string for almost 3 years). BG80 also last pretty long if you string it in low tension (under or equal to 23 lbs) and with proper stringer. BG65 last pretty long but power is lacking unless you string it in high tension.