First-time buyer seeking Banshee configuration advice

Hi r/Cmmg, I’m looking to buy a PCC for home defense as my first weapon purchase and have found the Banshee to be very attractive. I was wondering was owners thought of on barrel length and magazine.

Barrel length: I’m admittedly drawn to the 5” barrel due to a smaller profile (especially with a silencer) but have heard that the 8” has the advantage of space for accessories as well as being more quiet.

Mags: Glock vs AR conversions. Any pitfalls or hidden advantages here?