munch, munch, slurp...........
Sorry, couldn't resist. We have fans of a lot of different styles on here, so different people probably have different criteria they listen for in a drummer. I like both the guys you mentioned within their styles, but someone who's into country, or small combo jazz, or big band swing would be listening for different attributes than Joey or The Rev (R.I.P.) display. Therefore, you'll probably get some replies that there really can't be a "best" drummer. Personal favorites are cool.
Slightly off topic, I saw Slipknot on the side stage at Ozzfest one year, and it had to be 100 degrees out. They were in full gear. Every member of the band downed a full bottle of water in between every song. I was impressed they made it through the gig without passing out.