Glock or Colt 9mm AR lower?

[funkymonkey1111]

I am considering building a dedicated 9mm AR and I've seen lowers being offered for both a Glock magazine and a Colt magazine. JoeBob's has a 80% lower for Glock, but the uppers are always sold out. There are others who sell 80% lowers for the Colt magazine. Which one do you think? Or is it really just personal preference of metal mags verses plastic mags? The prices for each are about the same.

i've had the same question, but i am leaning towards the glock, especially given the 33 round mags available that i'm sure you pre-stocked prior to the ban.