AR-15s

The PSA rifles are fine. The Colts are better but not twice as good. You probably will not be able to tell a difference. Main thing is to look for Mil spec.
Everything will be built to par with qaulity materials and will interchange.
I own both and would not spend the extra cash towards a colt. That being said. I would pic the Colt over PSA if it was dollar per dollar.
It is your Money and your choice.