The best intermidiate junior tennis racket would either be babolat or wilson
There is no best tennis racket in the world. All tennis rackets have different abilities and technology. What I think is a good tennis racket is the Babolat Aero GT's and Wilson BLX's, they have a really good technology such as the cortex system and the GT technology.
Usually a dunlop racket is best for beginners as it has right amount of power a kid can control.
the best tennis racket is a babolat senior aero storm
Babolar revenge polyester strings.
the best racket to improve strength is 1.babolat 2.wilson 3.head
A tennis ball, when impacted, dissipates about 45% of the energy applied to it. This means that it only absorbs and returns 55% of that energy. That is why in the test standard for tennis balls, dropping it from 100 inches, it only rebounds 53 to 58 inches. It is returning that much energy. The strings of the racket, however, return 90% of the energy they are impacted with. So, when the tennis ball hits the strings and they stretch (absorb the energy), they will return 90% of that force in the return of the ball. When a ball hits strings with a higher tension, the force is exerted on the ball, instead of the strings, and the energy return is closer to the 55% range.
it depends on what works for you, but the number one tennis player, Novak Djokovic uses the head tennis racket, and it works really good for him.
There is no 'best string'. Even professionals use different strings because different strings suit different needs.
i think the one with the best durability and the best bounce and the best feel for your racket is : Wilson us open
Natural Gut, Polyester, Nylon, Kevlar,multifiliment,synthetic gut there is no "best" type of string because it is what ever best suits your game for example I use a all poly or a hybrid(2 different kinds of string at one time on a racket) because I hit with a lot of spin and brake string a lot.