Cosmo is my favorite to watch, but then I only watch a few speed runners periodically.
I think the question is a bit too broad though. You can have players who are extremely dominant in one game, or even a few, but then aren't at all in some other games or genres. How do you compare them?
Is it more impressive to be extremely dominant in a RTS like Starcraft or in terms of speed running a game like OoT, or SM64? I'm not sure you could get a true consensus on something like that.
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xp1337: Don't you wish there was a spell-checker that told you when you a word out?
GotD (219/384) Melee v FFX