It depends on which model and also your own personal preferences. The new head youteks have gotten great reviews. The instinct is used by Sharapova and Gasquet. The radical is used by Andy Murray and many other players on tour.
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I prefer Prince, but really it's a personal preference. Maria Sharapova used to use Prince, but switched to Head. Novak Djokovic also uses Head. Some tennis websites will let you demo rackets, so you could always do that, too.
Go for the Phantom and Tour series, they are great. you also should know what you are looking for