This is an impossible question to answer with just one name. I've been playing for about twenty five years, regularly, and there are different flavors of genius. Here's my top five (and there are probably ten guys who deserve to be on this list who'll I'll forget):
Buddy Rich - consummate set drummer - intensity, phrasing, chops, showmanship, this guy had it all. His biography by Mel Torme is fantastic if you wanna learn more about the guy. He was basically a child prodigy, like a Mozart of trap set. Not a lot of guys can even attempt to copy what he did, much less push the envelope like Buddy. He's the real deal.
Trilok Gurtu - percussionist extraordinaire - Trilok Gurtu came up an Indian classical musician, trained on tabla at an early age, he has mastered moving in and out of various meters, and has constructed a very interesting percussion set up that includes a bass drum that he plays with a stick, and a lot of various percussion instruments from around the world. Trilok is perhaps the most innovative and mentally acute percussionist I have ever heard. He just gets music, and like Buddy, his phrasing is remarkable. Here's a link to a very cool tune Trilok did with an amazing trio with John McLaughlin (from Mahavishnu Orchestra). There are many more from that concert, and some great stuff (like the Orient Express concert he did with Joe Zawinul) on youtube that are remarkable musical compositions. One of the absolute greats.
Vinnie Colaiuta - session drummer (that's like the understatement of the century, but what are you gonna say about Vinnie?) - Vinnie Colaiuta has probably the best hands and feet of anyone alive. If you wanna talk raw drumming talent, he's the guy. He played with Frank Zappa and the Mothers of Invention when he was like 18, sight read the infamous Black Page to get the gig (called black b/c there were so many fucking notes on it, and Frank wrote weird, weird shit). Vinnie has toured with some major players like Sting and Joni Mitchell, and has probably tracked more studio time on more high selling records than anyone alive. Here's his discography, and if you look, you can see he played the drums on a full fourteen albums last year alone. Vinnie is my personal hero, and I've watched videos of him dozens and dozens of times. In fact, one of the best examples of drummer porn is this video of Vinnie and Steve Gadd and Dave Weckyl, just laying down the fucking law. I've heard stories from a guy who's been to visit Vinnie, who was greeted at the door by Vinnie, who proceeded to offer his guest a practice pad. That's not a slam, that's Vinnie's way of asking someone if they'd like a refreshment because, to Vinnie, practicing is life.
Elvin Jones - jazz master - there's something about the way Elvin approaches the instrument that sets him apart. He just doesn't hit the drum like anyone else. He has a studied precision that is deceptively loose, and really makes the drums speak with what one might call a very "authentic" sound. His discography may well be just as big as Vinnie's (or Buddy's), I don't know. He played on every single one of Miles's early records, as well as many of Coltrane's greatest recordings, and many, any other great records (I mean, that Night in Tunisia on Blakey's album is unreal). "A Love Supreme" by Coltrane has some of the most sublime drumming ever. The ride cymbal alone is just incredibly tasty. It is not an easy task to pick out exactly which notes to play to complement the rest of the music, but Elvin just seems to always know. A complete and utter badass.
John Bonham - rock god - it is difficult to overstate John Bonham's influence on modern rock drumming. His tone was something that sound men talk about in whispers. When he played it was like the thunder had decided to sit in that night. Huge, huge sound. He worked with odd meter in rock music, signifying an early indicator of the progressive rock music that was to follow. He played on tympani and gongs, used what was essentially a marching bass drum on his kit, played with his hands, as well as being one of the first people to use a 32nd note in rock music (most notably on a standalone drum solo called Moby Dick that has inspired generations of aspiring rock drummers since it was recorded). The guy was unbelievably massive in scope. He could be so, so gentle, and then so, so heavy.
I swear I could write fifty more pages of material about all the great drummers out there, there are sooooo many more great. JoJo Mayer, Alex Acuna, Dennis Chambers, Keith Carlock, Max Roach, Dave Girabaldi, on and on and on. But these dudes are the best of the best I think.