Ok, so as of January 3rd, 2007, Jack still holds the crown because of overall wins (82 to 61) and majors won (18 to 12). Im only 28 so i've grown up in the Tiger era, so the assumption is i'd say Tiger. No one in thier right minds can deny who Tiger is, where he stands, or what he's accomplished. Tiger, as it stands statistically, is a top 5 golfer of all time. Everyone is assuming that Tiger will eclipse Jack's numbers, and in the event he does, then we will have a real discussion on our hands.
It's too premature to judge who's better until you see their entire body of work. What if Michael would have stopped at his first retirement and winning only 3 championships? Jordan was considered the best at that moment, but what solidified him as the greatest were the additional 3 rings, 3 scoring titles, and 2 MVP's (post retirement number 1). Im a Chicagoan so i'm biased as all hell here, but if Jordan didnt accomplish the second 3 peat, there would be alot more discussion on who's the greatest. Magic Johnson? Larry Bird? Wilt? Bill Russell? Tim Duncan? Jordan cemented his G.O.A.T. status by eclipsing a slew of additional records and putting a stanglehold on the NBA for another 3 years. That's why he's the greatest...because he proved his championship status. Same thing is now being said of Tom Brady (albeit if he wins another Super Bowl). He has the records (touchdowns and undefeated season), but it will all go waste with no championships. Pete Sampras? Martina Navatralova? Pele? Same thing.
Point being...barring any forseeable injunction, Tiger is on path of demolishing all records in the forseeable future. 25 majors? 100 plus wins? It's all there for his taking, but it's going to take time. If and when the time comes, no one, not even Tiger himself, will be able to argue against him. So for the time being, Jack is still in the driver's seat of an old classic 67 Chevy strolling down the Pacific Coast with a high speed Ferrari on his tail :)