All that matters it that they work in YOUR guns...
I have CProducts...
A few years ago I built an AR15 in 7.62x39.
The only mags I could find that would reliably feed were the CProducts mags.
I agree with Kirk.
Try a few different makers and see what works in your gun(s).
I have PMAGs and Troy BattleMags. Got the different types to segregate 5.56 and 300 BLK loads, they are both good quality.
I just watched a video where Larry Vickers recommended the Tango Down mag, so there's that.
Larry Vickers=Tango Down, I like Larry but he puts his products at the front.