Yeah, I mean if you want to buy a suppressor then got 300blk... If you are looking for something to hunt with go 450. That's what I think.
I do enjoy the AR platform for its versatility and would agree 450BM (or even 458) is a good choice if you want to hunt with it. Besides deer, it would be a good choice for hogs.
I'm not going to say 300blk isn't a capable hunting round; it certainly has a lot going for it. But as of right now it's not IN deer legal when used in a rifle. With current hunting laws and ammo availability/production, I feel it’s kind of a novelty (for my current needs).
Then again, someone else would probably tell me my 5” suppressed 9mm SBR would be a novelty. You just have to decide what you want to do with it, and go from there.