That will let you focus on your boots instead of avoiding collisions and forcing turns just to stay on the trail.
Not my experience skiing Loveland during the first two weeks of December. By then, most all the race teams are gone and it's pretty darn quiet. Early season last year at Keystone was far busier and congested. Of course, everything depends on the amount of terrain open at respective resorts, and the amount of uphill capacity feeding that terrain. And if the boot work is being done in Breck or Keystone, of course makes far more sense to be local to them.
In both cases skiing Fri -> Sunday. Both are certainly emptier during the week.
If you have an Epic pass, Keystone/Breck make far more sense. If you're paying day-rates, a 4-pack to Loveland puts you way ahead.