Yeah, I found that out and then restated my question lol.
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I don't want to talk you out of doing Alchemy as a main skill because it is very useful (some jugs, Holy Water, Echo Drops, Antidotes, Poison Potions, Remedies, Marksmenship/Archery mats with the right sub). However if you are going to choose one or the other I'd suggest Cooking since it produces most of the jugs and all of the petfood, and even this bad boy:
http://images1.wikia.nocookie.net/__...DawnMulsum.png
Personally my suggestion is to do one on one character and have a mule or have your friend do the other. You may want to look into Synergy when discussing this with your friend.