There is never a single "best" in any art form. Both Hendrix and Segovia are great, but they can't be compared to each other. The same is true of painters, composers, writers, etc. It's not a foot race where one will have the best time - these people are going to different finish lines!
But there are some great drummers who haven't been mentioned here:
Clive Bunker (Jethro Tull)
Danny Seraphine (Chicago)
Terry Bozzio (Zappa)
Colaiuta (mentioned already, I know)
And that's just rock. We won't even get into jazz. But the same holds true - there is no single "best" in art.