Warriors have cheaper items compared to rogue but lesser damage as we all know.
Warriors are preferred in cata runs because of their 6x str ult and with proper krak gears. They can kill the boss in one burst, if not close to being dead.
Rogues are strong with proper items, they can deal massive damage even without armor proc to mobs. They are both good for cata and rahab.

It's probably best to take note that cata is ending in a week. Esp if you're aiming to be a warrior just for cata. Best of luck!

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