Am I wrong in thinking that, for most run of the mill passenger cars, pretty much any battery that comes from a good auto parts store or even a place like walmart will work as long as you match the class to the application? e.g. A gold class with higher CCA for a Northern climate, a Platinum AGM for some application where the battery might get jostled a lot, etc...
Or is there really a big enough difference that I should research any battery before I buy it? IIRC almost all batteries in the US are made by like 3 or 4 manufacturers, I doubt they can all be THAT different.