To 5.7 or too .300 block?

Looking for some suggestions or thoughts on which is a better investment for an ar pistol

.300blk will be less finicky in the long run.

Another vote for 300blk. Suppressed subsonic 300 is the cat’s meow

The 300BO has more stopping power if you’re using it for home defense. Also, when suppressed, it will reduce blast noise and blinding effects. So, best choice for HD IMO.