I would think consensus would be a suppressor. Anything else would depend on what you are trying to accomplish??
A linier Comp looks cooler but you have to remove it to clean the insides well .
I tried a suppressor on mine, a silencerco Osprey model and I lost all accuracy. By lost, I mean it wouldn't put 5 shots into a 6" circle at 25 yards. I'm not sure why, but that was my experience with trying to use a suppressor. I'll probably try again some day.