Which will let me hit flat shots but will let me hit lots of spin when needed??
Improve your technique. Roger Federer hits it flat and hard or with a lot of spin with a 90 sq. in racket with a dense stringing pattern. Sampras was able to hit his serves with more spin than anyone using a 85 sq. in racket with a dense stringing pattern. It may sound like a broken record but improving your technique will help you a lot more than going on the racket-go-round.
Improve your technique. Roger Federer hits it flat and hard or with a lot of spin with a 90 sq. in racket with a dense stringing pattern. Sampras was able to hit his serves with more spin than anyone using a 85 sq. in racket with a dense stringing pattern. It may sound like a broken record but improving your technique will help you a lot more than going on the racket-go-round.
With respect, Tiger Woods can hit a drive 370 yards but you or I will never hit one that far with his driver. With good technique you should be able to get decent spin with any frame, but talking about what Sampras and Federer can do is really not relevant.
OP, you have to demo.
I feel like a lot of people would say the pure drive line. But the 6.1 wilson line has been one of the most overall balanced in terms of ground game, net game and service.