None of them. He was outplayed in all seven finals he lost and deserved to lose. There's no final where one can say he was particularly unlucky to have lost.
This is false.
It's true that you can't change the past, but he wasn't outplayed in so many matches that he lost.
The same at some tournaments he won like 2009 RG SF. That could go the other way easily.
But if you think Federer was "outplayed" in 2009 USO, 2005 AO, 2009 AO and 2011 USO, you're really missing the point of the sport.
And this is not coming as a fan. It would be the same if you say Djokovic outplayed Nadal in 2012 AO or 2011 Wimbledon, or even Federer "outplaying" Roddick in 2009 WIM.