Both are tied at 6 "slams". However, Venus has 4 Wimbledons and Justine has 4 French Opens. Since Wimbledon is THE most prestigious tournament, I think Venus still has the upper edge at the moment, even more so compared to Serena's 8 "slams". I think Wimbledon title = 2 times US Open/French Open/Australian Open. So, that should put Venus in the lead at the moment. Agree?