We had a Sam's card maybe 20 years ago when they came around. Then Costco came, and we had both cards for a number of years. We much preferred Costco. Sam's always seemed dirty, dark, very little help around, very slow to open additional checkouts if crowded. I mentally compared Costco to Sam's like Disney World to Six Flags Great America.
We dropped the Sam's. We always get our gas at Costco, most of our electronics, rental cars a few times, my eye glasses. Any Kirkland item is great. The deli area with the fresh food is great. We like it.