Piston or DI for a Grendel Build?

[sneaky one]

I have an Adams Arms piston upper- used to be sold as a Huldra upper through Mills Fleet Farm store. 5.56 It is very accurate, reliable.

Less cleaning is the idea. Not sure if I'll suppress this one. More interest in suppressed hunting tube in Grrr tube.

In fact, I may swap parts out - between the 2 uppers to create my first piston Grrr.,, 16" tubes - both- mid length system. Hmmmm.......