I and two (2) friends have gas piston AR's - mine was made by Adam's Arms and it has never had any sort of problem and with the right ammunition, guided by a rifleman, it shoots right at 1/2 inch groups at 100 yards rested and scoped.
I highly recommend the gas piston AR but I have never shot suppressed, so I can't speak to that portion. For reliability, dependability and keeping the action clean - the gas piston AR is as good as it gets. The DI AR's are just as good, but no where as "clean". Your money, your choice.