I said this earlier today, and I will say it again. Anything that isn't a niche ability will overshadow Unaware.
Seeing how Unaware has done little to nothing for Argho, as most are too scared of running into HazeHawk to run set-up anymore, Unaware might as well have had no ability at all. It's so bad in this meta, it essentially has no competitive ability at all. Unaware is great in OU, because set-up sweepers run rampant there. However, the never ending threat of HazeHawk shut down set-up in this metagame, making Unaware worthless. The only thing I can think of that sets up is DDMence, and even then I've never seen an opponent use it (I have started to though) and Clefable blows it back anyways. Comatose actually gives Argho something to be worthwhile to use. Physical attackers will appreciate something usable that can sponge status for it, and Argho itself is included. It still gets blown away by Koko, Lele, and Bulu, and Fini stopped status anyways. Comatose doesn't remove weaknesses, and it doesn't even do anything with ComaPhazing besides maybe Stealth Rock stall, but the second something it's weak to comes out, it's game over. Majority of teams bring a Tapu, all of which have some fairy Attack to work with (asides bulu, but it has grass attacks). Lele especially destroys it if it is either max speed or scarfed. Comaphazing might be annoying, but without Circle Throw, it stays at that alone. Besides, if I'm correct, Sleep Talk still fails if you're awake with Comatose. But then again, I've never faced Sleep Talk Komala (does it even get it?). Comatose allows Argho to outclass Tapu Fini in almost every way barring the amount of weaknesses (5 for Argho and 3 for Fini). Last thing to note is that it allows it to be on the receiving end of VoltTurns, and IF it got U-Turn itself (which I'm not banking on, but with Comatose I see it happening), it would fit right in with VoltTurn cores, being a more physically gifted and bulkier option to using Greninja.
Tl;dr: Comatose or bust.