BjornBorg also said that federer better than sampras

Federer has the better backhand, is a little quicker on the court and has better finesse with his groundies. He can take pace off the ball better than Pete and mix it up better. His groundstrokes, while acknowleging that his backhand can occasionally go astray, are more consistent than Sampras.

Pete has the better serve and better serve and volley game. But Federer is the more talented overall.