I never pay a terrible amount of attention, but I like the crouch animation of a female Blood Elf in Stealth. When you're completely still they stay really low to the ground on all fours... you know, actually looking sneaky. Kind of like someone crouching down to peek over the edge of a cliff without being spotted, if you can imagine that. Walking around still looks skulky, too. Part of the reason I rolled one because well... Rogue is always in Stealth for the most part.
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Maybe you should make rogue, level them up to 3-4 lvl to get stealth (I can't remember when you get stealth... anyway 4th level you will get in few minutes) and then decide what animations you like the most. You can also check some warcraft movies.
Best advice. Though Orc are so stubby they look kind of odd doing anything remotely sneaky. I only know that because of the Fel Orc costume you wear when you're grinding Netherwing rep/