Strictly from a meat buyers perspective, Sams wins hands-down for us. We have a membership to both clubs and I can honestly say that I am very rarely purchasing meat at COSTCO.
The bonuses for us:
No bone-in butts at COSTCO, Sams has.
No Briskets of any kind at Costco, Sams has.
I like the ribs I get better at Sams.
I can get online and check Sams current meat prices locally.
I think it really does have a lot to do from location to location as another poster mentioned.
It should also be noted that 99.9% of Brethren do not live in our state, so we may be the exception to the rule.
Crash - HIBarbeque.com