Originally Posted by
Biomega
I believe Herbalism and Engineering are the best for Warlocks atm, at least for Demonology. Rolling with the Herb haste buff for 2 minutes is apparently good.
Engineering has traditionally been the "skilled player" profession throughout many expansions, as it offers a lot of tools to edge out an advantage with by using them smartly. Be watchful of the PTR, though: if epic gems are introduced, we may see Blacksmithing pull out ahead again, due to the increased value of sockets.