said by cymraeg:they all bring roughly the same bonus no matter what prof it is the utility of certain profs that make them more preferable, what Vince says is correct about the armour kits and bracer linings but the skinning at lvl 90 only gives you about .75 % crit, you could go with enchanting and get the ring bonus, would probably be better off.
I'll give Leatherworking a go then.
Does Alchemy still double the length of elixirs?