The winning percentage on hard are the following (http://tt.tennis-warehouse.com/showt...php?t=454579):
Things to note:
- The data for Laver are relatively small (but big enough for his winning percentage to be relevant nonetheless).
- Connors played for a really long time, which make his result very impressive. However Fed's data are even bigger, which is impressive too.
- The winning percentage don't weight the importance of the tournament.
The ranking by number of titles is the following:
1. Fed - 52
2. Agassi - 46
3. Connors - 44
4. Sampras - 36
5. Lendl - 31
Given those two ranking I would say:
1. Fed (he has more of everything)