Vote, by meer opinion... I prefer CNC cut rifled barrels. Just seems like more control & less stress on the barrel. That doesn't mean the others are less accurate. But is the twist consistent as the button is either pushed or pulled...probably I not but to what degree. I remember Lilja looking at that delima many yrs ago to come up with a valid instrument to check. But then is slight inconsistent twist rate harmful to accuracy. Some gain twist shoot very accurate, and many prefer them, I do not own one. But for combat AR style shooting, I prefer hammer forged, machinegun steel, and crome lined or some tough barrel treatment...no fancy stainless...it's a tool that must preform over the long haul under severe conditions, used hard, even abused..accuracy is not at the top of the list.