I'm partial to my Choco, simply because thats been my nikka since day one, since closed beta.
A good tank will know that and not move. One thing I hate about the earlier dungeons (post 30) is that the tanks are all moving around like fukking fire ants and fukking up people's rotations.
I literally had one PLD tell me "You have to move when i'm moving because I'm the tank and i'm the leader....and DRG only needs to hit from the side. "
This nikka only had one job above 35 and that was the PLD he was playing