You get XP for gathering herbs and ore nodes. In my current team, I have shoulder & chest heirlooms {+20% XP} on my slaves, but none on my main. Instead she has Herbalism and Mining and at level 42 the main has had a fairly consistent lead on XP over the slaves with heirlooms. So I'd suggest using your heirlooms and grabbing either one or both of those professions on the other toon. If your heirloomed toon does manage to get ahead, you can always take off the heirlooms before you turn in a few quests. No reason to not use them.
Also, heirlooms are battlenet account bound. If you have both accounts under the same battlenet address, you can simply buy more heirlooms and send them over to the other toon or do 1 on each if you don't want to buy more.
Connect With Us