Only advantage to 16” is being able to change compensators easily, disadvantage is weight
14.5 advantage is lighter weight, 14.5 disadvantage is comp is pinned and welded.
Personally I went with a shooting innovations 14.5” barrel and apa comp. imo shooting innovations has one of the best barrels out because of the weight and ramp. It is also very accurate. Mbx is another good barrel with a 13.6” barrel and 2.6” comp. Another hot ticket is brekke comp and barrel 10.5 or 12.5 with a shroud to make the difference.