M.N.
I have been a member of both, but prefer Costco. Perhaps the membership fee is slightly higher (nominally so), however the reports on how both companies pay and treat their employees meant more to me than that nominal fee. I know this isn't a forum for political feelings, but suffice it to say that if the slightly higher fee helps to pay employees a living wage and health benefits (do a Google search for more information), I'll keep my membership dollars going to Costco.