Stupid question, Survival ftw! No, realy... The best hunters i've played with have been beastmasters. They don't top dps meter, but that's because their pets don't show there i think. Marksman might be better at some points where having a pet up ain't smart, such as gruul i think. Also there's a big chance for your pet to get killed at some point in fight, then you're gonna have to spend time and lots of mana on ressing it, unless you got that figgin talent(wich you should have i guess). Well, i guess my answer is that I who is a pala, can't decide! cloth? mail? Plate? Bubble+hs? gogo powerrangers?
Anyway, i say MARKSMANBEAST!