I'm not in Sam's Club as often as Costco. But I've noted the in Costco, different regions of the country may have different suppliers of GC2's. Perhaps Sam's Club is that way too?
And OP, only other item I'll add, at least until you quality what your objective's for Best is to you:)!
If you boon dock/dry camp often, the fastest recharging (Shore Power/Generator/Solar/Wind) batteries will be:
1) Lithium
2) AGM (Lifeline's are ~20% faster at recharging - if you have a charging system that can maximize power in Bulk mode. We have X's 4 Lifeline L16's - and wish our Magnum MS2812 could produce more power for Bulk, as Lifelne's, especially this size bank, can handle just about anything you can toss at them:)!)
3) Conventional Wet
So if one of your criteria's is for faster re-charge, their's some Hmmm info for you:)!
Best to you, and all,
Smitty