When we lived in Alaska we had memberships to both. When we moved here to Ohio we dropped the Costco because of what was available. Sam's clubs is 20 minutes closer but it always seems to be the same items. It also seemed that Costco had better quality clothing items and such. But it has been 10+ years since I've shopped at one. Our Sam's membership is done at the end of this month and I'm thinking about switching. Both offer free shipping now. Prices are comparable on the items we buy on the regular. What do you use and why?