I you want quiet just go with an air powered gun small and light weight
Most all the battery only powered cordless (no gas cartridge) are pretty bulky and much heavier.
There are several good videos out there on different cordless units Concord Carpenter did a 16 ga. head to head
Woodworker Journal did the 18 ga. brad nailers.
Personally I'm not found of the windup some of them have before they fire such as the Ridgid, Ryobi, and especially Dewalt
C C gave Ryobi a great reviews and RealTools raved about the Ryobi and it seems to be very user friendly plus generally inexpensive at less than $200 with battery and charger.
I would have maybe bought one but I really didn't want to add a different battery system to what I have already invested in Milwaukee so that is the finish nailer I am using now. The 16 ga. angle nailer. It has it quirks but it works just fine and IMO any failure to set nails outside of hitting a knot is mainly due to operator error not contrlling the recoil