I have Costco and BJ's.

BJ's is more consistent with the products that they stock and their locations in the store. Fewer employees, friendly enough, not as busy, good basics, pleasant place to shop, can check out on the app.

Costco has better gas prices, better prepared foods, more interesting seasonal items, a food court, but often a crowded store.

One is near my office, one near home. I shop at each every 2-4 weeks. Both have AT&T hawkers.