The game Sampras played is very different from today's game. Almost no one serves and volleys anymore. They play baseline, creating angles and then come in only to finish a point when they get a short ball or have a great angle for a winner. The spin and power today's players are able to play with (probably due to better equipment) has changed the game somewhat. Sampras was an all-time great but I think, in his prime, Fed is the better player. As someone else mentioned, Laver is probably the GOAT. If not for pro/amateur rules during his prime, he surely could have won 25 or more GS events. Won all 4 before his 6 year exile, then won all 4 again the second year he was allowed to play. He missed 24 GS events. He could have easily won half of them during that span. That would have put him at 23 and it's not a stretch to believe he would've surpassed 25 by winning another couple during that period.