In my mind it makes little practical difference. Are you loading longer match grade bullets which benefit from more free bore? I think either could be a good choice, depending on how you use it. If you are shooting light (relatively speaking) varmint bullets, free bore might not be your friend. Shoot both with your loads and see what works best for you.
Basically this rifle in mind is a 16" AR-15 with a LPVO optic 1x8 that I plan to use for drills for a course of fire and some marksman type shooting from a bench or bipod I see myself using 55gr 223 projectiles that i'll be handloading in bulk.