the AZ brand is actually a champion labs. there's nothing wrong with it, works just fine.
I prefer the ATP brand only because I like their pan gaskets! They're durable and I've never had a leak out of one.
the Wix transmission kits are ok, I'm not a fan of cork, which all Wix's seem to be, I do like their filters though.
the Hastings are good, I used them like 20 years ago a few times, nothing spectacular about them.
ATP makes some very good stuff, and the pan gaskets say a lot for me.