Best profession for tanks?

Hello folks, just asking a simple question, what's the best professions for tanks?

I'm planning a to roll a Worgen warrior, but I'm quite undecided on what profession should my warrior learn.

Ive done a little research on Leatherworking & Engineering and they seem to have some nice exclusives.

Leatherworking has:
Charscale Leg Reinforcements"
http://www.wowhead.com/spell=85068

Draconic Embossment - Stamina"
http://www.wowhead.com/spell=85007

Engineering has:
Cardboard Assassin
http://www.wowhead.com/spell=84425

Grounded Plasma Shield
http://www.wowhead.com/spell=84427

So, I should I pick from either of the two or is there another profession I should go for?

My second spec for my warrior will be for PvP. If I factor this in, is there a more suitable profession combination for me?