You can only have 2 JC gems equipped now, not that it matters, the bonus is still the same.Just about all crafting professions are relatively equal:
- Blacksmiths can add sockets to two pieces of gear to put additional gems into
- Engineers have the Synapse Springs (1 minute cooldown on-use that gives you a pretty big boost to your primary stat for like 15 seconds - kinda like a 3rd trinket)
- Enchanters have access to ring enchants
- Scribes have access to stronger shoulder enchants
- Jewelcrafters have access to very strong, exclusive gems (up to 3 of them)
- Leatherworkers have access to fur linings that are stronger than normal wrist enchants
- Tailors have access to cloak embroideries which act like a 3rd trinket as well, except proc-based.
- Alchemy gives boosts to flask and elixir duration and potency
Just about all of these offer the exact same stats bonuses over an extended period of time, but I believe Engineering remains the strongest because you can time that 1 minute cooldown to stack it with a LOT of other things (for example, my Warrior has his Synapse Springs, Blood Bath and Dragon Roar, all of which have a 1 minute cooldown, macrod together)
Gathering professions are a little iffy, though. The bonuses they offer (stam/crit/haste for mining/skinning/herbalism) generally aren't that great.
---------- Post added 2012-11-20 at 04:04 AM ----------
You gain +480 in secondary stat JC gems.Because if you are a class that values secondary stats over primary (tanks, for instance) you only gain +320 secondary stats through JC gems. Blacksmiths gain +640.
If you value primary over secondary, it's not really a concern. Until epic gems come out. If they don't buff JC gems, JC becomes the worst perk, blacksmithing becomes the best, and all the rest stay the same, in the middle of those two.
So if you're choosing between one or the other now, and your main concern is flexibility in your perk (and no chance at being shafted come epic gems), pick BS.