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There's really no class-exclusive benefit to professions in Vanilla (aside from Robe of the Void, which costs way too much to make), so it's up to you in the long run. The only reason I'd go tailoring is for the Bloodvine set bonus. Alchemy is better because of all the money you'll save by making your own consumables for raids. If you PvP on a serious level however, I'd definitely recommend Engineering.
I'm planning on leveling my warlock with alchy and herbing, and use my mining/ herb rogue alt to hoard engi mats so later I can end up with 2 crafting professions on the warlock(the main), and world pvp while gathering on my rogue, yay
Edit- Unless you're a pve tryhard, the 2% crit is worth losing for the engi benefits in pvp (also shadow reflectors for twins hueh)