I think peak Djokovic vs Peak Federer (let's say, 2011 vs 2005), would be close. The thing is Federer was able to mantain his peak level for a much longer period of time.
AO 50/50 (Federer is underrated there, in 2008 he was ill, in 2005 he played against an awesome Safin and still had matchs points, in 2009 and 2012, he was great despit his failures against his nemesis)
French 55/45 Djoko (Federer played better in 2011 against him than 95% of his matchs in this tournament, even in his peak years)
Wimbly 90/10 Sorry but it's a blowout here.
USO 60/40 Federer