The f2000 would probably get a vote.
Reasonably long barrel for less muzzle pop, plastic body to dampen the noise and most of the noise being cradled by the shooters body is a pretty good recipe for quietness.
That said, it isnt that quiet as the user given your ear is right next to the box so i'm mostly relying on the comments of others.
Generally when it comes to quietness its usually hpa's and gas non-blowbacks (mk23, revolvers etc) that get mentioned, where you can be standing 6 foot away from the shooter and the sound of the bb's hitting the target is more audible than the gun.