For me, it has to be Tiger, no other golfer has taken every element of the game to the levels he has. Tiger is not only about the power game, he is the complete golfer in every way. Yes, Jack had more competition but its my opinion that golf had not nearly begun the revolution it is undergoing today (equipment, fitness, number of people playing, training aids etc), therefore players concentrated more on playing & winning. With sponsorships, golfers now have a more hectic schedule and arguably less time to practice with strain on playing more events due to sponsor money. Huge credit to Jack for being the golfer he was but Tiger is only just beginning his reign ...(my humble opinion)