I've not bought into the AR "pistol" idea and can't see it as something I'm going to do.

If I need a pistol, I need a pistol that is easily concealed under a T-shirt, if I'm in a vehicle, the pistol is still there. If I wanted an SBR, it would be a 10.5-11" SBR with a can. I used to have a 14.5" gun and much prefer the 16" version.

But for fun, it don't matter much what you choose.