Meh. For ARs Magpul is king for value and reliability. Can't beat it. BUT for other platforms there are other options. AKs seem to have particular taste depending on country, builder, importer, etc.
If using a non AR-15 firearm then whatever the issued mag is seems to be the best idea. I have an original Colt 20-rounder that I keep around because its classically sexy and helps when shooting off a rest. Otherwise, its magpul for serious use and whatever is on sale (that does NOT have a green follower).
I voted both. OKAY industries is pretty great too.