I don't really think 'brand' matters much at the same mAh rating for the batteries, although the Eneloop and newer types are a different internal configuration from the older 'standard' NiMH type. I am however a bit pickier on the recharger: I like the ones that have a good solid metal heft to them for heatsinking, as well as those with individual (per-battery vs. in "pairs") charge-full indications and controllers, especially for the more rapid charge types. I found one a while back that was also AA or AAA, which was nice as my focus lamp takes AAAs. Green LED shows full, red LED shows charging...so if one stays 'red' far longer than others you know to check it for heat and probably throw it out as dead.
And depending on your electronics, if you're buying the AA's in bulk packs, check them for identical 'nipple height' on the positive side of the battery. Sometimes there are large (2-3 mm) differences in height, and this can cause connection difficulties in some cases where there isn't sufficient spacing in a battery compartment (assumption being that the door compresses any springs all the way down, not leaving any part still in expansion). I've noticed this specifically in Ikelite DS50 or DS51 strobes, where mismatched battery nipples can lead to poor or sporadic performance, and posted about it in the Lighting subforum. So I've learned to 'sort' them in equal-nipple-height groups and use a Sharpie to number the groups so I don't have to compare nipples again every time.
OK, I admit it, I'm horribly immature and male. I just enjoy typing "nipples" over and over. Can we talk about battery "insertion" next? <snicker>