VERY broad discussion topic

Hi guys, hope are all well! I like to hear from some of u guys who might have a relative good amt of trig time w. a SIG 556 and also fair amt. of time w. any nice colt-styled m4 (6520, 6720…etc.). I know the gas system in the sig is usually the crowd pleaser, but lot of folks at local gun stores/ranges absolutely love their colts. Given these guns are = value, and the sig is much more tech. advanced for firearm than colt ar why is the price tag the same generally. Thanks guys in advance for ur opinions!