Hey Bryan!
Hard to say, depending on what you've got. I haven't sold much, don't have much to sell, but my eBay sales have gone off without a hitch, and they've lowered their final value fee to 3.5% on musical instruments to match Reverb.
I've only bought on Reverb, not sold. The plus side to Reverb is that its owned by the same people who own Chicago Music Exchange. They know their stuff, and from what I've read, they will get actively involved if there's a dispute about condition, etc., unlike eBay, which has a reputation of almost always siding with the buyer. In either case, you still have to face the possibility of a shady buyer disputing through PayPal.