If you want quick kills, I'd bring the .308 or 6.5 Creed. Supersonic and suppressed, they will all sound the same. With subs, the .300 makes sense if you're going that route.
The .300 BLK is a unique round in that it straddles the fence between pistol and rifle caliber. It works great from short barrels and is one of the main options for subsonic hunting, but I was not enamored with the one supersonic whitetail kill I used it on.
It obviously does work, but I would much prefer a .223 for supersonic hunting or a .338 ARC or 8.6 BLK for subsonic hunting.