Like a few of you have said, I don't think you can compare Jack and Tiger. And I will go further to say you can't compare Jones with these too. I say this because look at the difference in equipment to start out with. Compare the shafts, drivers, irons, wedges, putters, even the clothes are "better". Imagine how good Bobby would be if he hadn't been wearing a suit and work mock turtle necks and dress pants that were very good at cooling you. And look how far jack could hit it with old wooden clubs.
Then if you look at golf fitness looks at all the advances that have come along. An example would be TPI, they have 100s of excersices you can do that are all targeted at golf. They didn't have those back then.
Another thing is teachers and the swing changes and ideas that have come along.
IMO Tiger, Jack, and Bobby were all amazing golfers but just in diffrent eras. If you think you can compare a guy with playing with wooden clubs to a guy playing the latest greatest clubs your nuts, well maybe not nuts but you get what I am saying.
I could go on for a long time talking about how much the game has changed from equipment to longer courses. They were all great and won a ton but I don't think one is greater then the other. Some of you may think that you can compare stats like how many majors one but Tiger isn't pass his prime.
I didn't vote for this because I think that they are all amazing golfers just in different eras and its like comparing apples to oranges.