Originally Posted by
Sahugani
there are recipes that can only be crafted if you actually posess the relevant profession. All minus one weapon enchant for example. Or the items used to upgrade your crafted gear.
EDIT: The garrison BS building offers you additional cooldowns for crafting mats, so you can craft your gear sooner than just with your own cooldowns. I believe that is true for all crafting professions.
Personally, I would take blacksmithing for my warrior, because you can craft and upgrade your gear as BS (although you could try and get them made for you, or buy them off the AH)