The warrior does a lot more damage than the hunter. He also MS's you.

I generally kill the healer first, then the rogue, then whatever is left. I like killing the rogue second because having to move my alts out of the poison cloud reduces my DPS and makes the fight last longer. As per the other thread, exiting the instance and resetting the champions after you've dismounted them gives you as much time as you need to set up totems, etc, and makes the fight a lot easier.