I have a Wilson Zen 103 Team ($79) and a Wilson Four 105 ($99).
I bought the Zen pre-strung from Sports Authority and the Four from a pro tennis shop. The Zen has Wilson Sensation 16 string but I don't know the tension. The Four has some unmarked blue string, thinner than the Wilson, and the tension is 60.
While I don't have a lot of experience I think the Four has more power. I mean, it feels the same when I hit the ball against a handball wall, but it seems the ball bounces back a good 5' to 10' farther.
If this is true, could this be because of the extra 2" or would it be the string? Or is it all in my mind?
If 2" doesn't mean jack then maybe I should restring the Zen? Frankly, I think it looks like a better racket.
I played with my wife's Prince O3 110 and I can tell that has more power. But 103 to 105?