Most Impressive List in Golf

We can't decide here at Golf Predictor which of the following lists is the most impressive:

1. Golfers who have won a career grand slam
2. Golfers with the most major victories
3. Golfers with most US PGA Tour wins
4. Golfers with most European PGA Tour wins

So, why not have your say. Let us know which one you think is the most impressive! We're veering towards number two above, but it's mighty close!