I just bought two batteries in the last couple of weeks. The Acura came from the factory with a 550 CCA Johnson Control battery. It was replaced with a Napa East Penn battery with 700 CCA (only place that was open). My Pontiac came with a 600 CCA Delco and it was replaced with a 600 CCA Delco. I agree in cold areas like Minnesota its best to get the best rated one you can but these have been fine for me and fit can be a real issue these days.
Personally I’m done with Walmart unless that’s all thats open and I’d replace it again within a week. Where I got the Delco, the guy said they get batteries delivered twice a day. The one I got is about a week old. The last of 7 that size that were delivered the previous week. Since Napa switched to East Penn, they are supposed to be better than before.