Might as well ask the following additional questions : 1) Oval or isometric ? 2) Flexible or stiff shaft ? 3) Hold or replusive ? 4) Head heavy or head light ? But IF you are not sure how to answer ALL the questions above - GO BUY A YONEX CARBONEX 20sp ... ALL QUESTIONS SOLVED !! - Li-Ning doesn't produce any racquet as good as this one !!
You also might want to state your budget and playstyle (offensive, defensive, control, smash etc.) and a few things you liked and a few things you didn't like about your last racket(s)
Based on the absense of playstyle given, it's going to be more of a brand thing for you. I've been using Yonex for 10 years and noticed that durability is becoming an issue lately. I currently like Li Ning more than Yonex just because I don't like any of Yonex's new line of rackets with the exception of the ZF.