The question was at the moment, and at this point, the clear choice is Tiger.

Even relatively statistically, Tiger's got the edge overall.

Now, I'm no Tiger fanboy, but I can certainly recognize a great golfer. Now if only he could get a grand slam... 2006, anyone? (Provided he doesn't figure he knows more about the golf swing than, say, Hank Haney or Butch Harmon).