2u or 3u Would 2u or 3u be better? I heard 2u feels heavy like other 2u rackets but swings faster. But 3u has less power than 2u? If I get 2u, it might play slower equivalent to other yonex 2u. If I get 3u, maybe I won't have enough power as 2u. Also, does TW coded ns9900 play and feel the same as SP or JP? Same durability?