Help me decide

[EastTNHunter]

I bought an 18” to begin with, but ended up with a 20” and no muzzle device. Same length, similar weight and balance, 2 more inches of barrel for a little more velocity. Also, the muzzle device tends to throw a good bit of sound upward, which ends up back in my ears when fired from a shooting house with a long roof overhang. 24” just seemed too long of a barrel on an AR for me. I don’t care for the shooting house for my purposes, but it’s easiest to setup the kids in for whom I built the rifle