That's an extremely tough call to make. Federer has won his major's much faster than Sampras and I'd say is set to break the record of the most won. I seriously don't know which way to go. By the end of Federer's career, whenever that will happen in the future, I think his statistics will say he was the better player. Of course, do we then go off of statistics.... What was the longest Sampras held the world number 1 spot on the rankings without being touched?