I am pretty sure that even if you bought the Steam version you would still have to use Uplay. I have Far Cry 3 and Assassins Creed 3 on Steam and each time I played them Uplay had to be opened before I used them.
I find it stupid that I need two different accounts to play one game.
Yes if you got it through steam you still have to use Uplay. I have Heroes Might and Magic, Driver, Splinter Cell Conviction and they need both platforms.
[Edited by ServiusTheBear, 8/29/2013 4:17:20 AM]