Ovi has a bigger body to throw around, but I think he's kinda dirty with it. Not as bad as he used to be. Ovi is most definitely the better goal scorer, but I don't think he is the better player. Crosby spends a lot more time playing a 200 foot game and is always looking to create a play for a line mate to score. Crosby is a much better passer and sees the ice better.
Plus, I just think Crosby has been a complete Pro at representing the Pens and the NHL as a whole and he give back to the community in Pittsburgh and in Nova Scotia. That's why I was so aggravated that after he came back from injury and had a great season they gave the Hart Trophy to Ovi (the last time Ovi won it) because he had a few more goals, but no where near as close when it came to being a complete player or a complete teammate.
Crosby will likely never win another Hart Trophy because lots of players have caught up to his skill level. Crosby still has good years left in the tank, but though it pains me to say it, he is not far and away the best player in the league any more.