Why not just mining and skinning, get both buffs?

enchanting is easy sauce now, only need runed copper rod and open the cash register

I forget what profs your other chars have, but mining is largely useless if you can get your ore other ways (and are not a tank, obviously). The skinning/lw suggestion is really great - I hadn't thought of that the other day when we talked about profs. LW is a b*%$^ to level though, imo.

You can have a total free-for-all in Panda skinning though. SO many places have mountains of dead animals due to quests/dailies. Now that there's AoE looting most people are pretty good about prepping all the animals to be skinned, too.

it doubles the length of flasks... so my guess is elixirs will have double duration, too.

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.

Crit is actually your best stat as a warriror even over str at the moment. I would reccomend going skinning/ Leatherworking. Skinnning gives you 450 crit and leatherworking gives you 320 str and basically free BIS bracer and leg enchants.