I remember saying after the Fedal Indian Wells match that I would wait until Fed manages to beat Nadal in consecutive matches before I'd get excited (if he ever beats Nadal twice in a row again).
Considering Djokovic and Nadal aren't scheduled to play each other until Madrid I'd still exercise a little caution here. If yesterday's match had been an epic on the scale of Madrid '09 or Miami '11 and Nadal had still won, then maybe it would be different, but when these top elite players are beating each other this handily I think it's more an indication that the loser, for whatever reason, just didn't show up.
If they meet in Madrid my favourite is still Novak, but if they meet in Rome my favourite would be Nadal, and again at RG.
"You used to be able to disagree with people and still be friends." - Clint Eastwood