Originally Posted by WesternSkies

There isn't a wrong answer but Denver is slightly shorter commute with similar options, Spirit, Frontier, United and American, with SouthWest going to the same airport in KDEN. If you have friends family or loved ones, originating your commute out of the "wrong" airport is less of a hassle than it sounds.
You could even two leg it through COS, if it came to that.
Try them both out if you want.