Finally saw the first couple of episodes from this and the Discovery Channel one. They're both pretty good.
The thing I don't like about Planet Dinosaur is that the posture of the dinosaurs never (or hardly) changes. They look very stiff. Real animals are like never in the same position 95-100% of the time. They twist around, crouch, peer over and into things. That said, I do prefer the more documentary style to the almost sitcom-y nature of Dinosaur Revolution.
I will say, though, that the animals in Dinosaur Revolution seem a lot less stiff. this is probably a function of making them characters and anthropomorphising them a bit. When the sexy lady Eoraptor showed up in the first episode, I almost choked on my tea.