Using the Engineering one for now and it's easily been one of the more profitable ones so far. Found 2 pieces of glass that made me ~40k on the AH combined. Although I don't really expect those prices to hold. First one made me 22k, the second one 18k, so prices are already dropping. If they start to drop really low I'll just craft a pair of goggles for my transmog collection and then switch back to Bloodhunter. The Engineering crafting components that drop from it can really clutter up your bags.