leatherworking ot blacksmithingFollow

lvl40 shaman have both slot open what trade skill should i get, and what one will help me the most leatherworking or blacksmithing.

I'd go Leatherworking. I'm happy with both of my crafted epic sets (though I've yet to ever experience solid DPS via Enhancement, even with the full crafted epic set. I can only assume I need epic weapons to really make it shine - my current best are only 71dps weapons.) With my Ele set in PVE I can put out some insane DPS.

Blacksmithing seems to have a drastically lower amount of things you can make use of. It'll get you some nice weapons, but it just doesn't seem worth it to me. Particularly since I think it seems significantly more expensive to level.