When you mention "maintenance vs rent" it makes me question, are you buying this to use or are you buying this to make money on rentals?
Because, I think in renting, people are looking for accommodations that are family-friendly with lots of amenities and are as close to ski in/ski out as possible. But for me as an avid skier, I know those amenities come with higher maintenance fees and I'm willing to let go of some of them go to have a lower per night cost.
So I would say that the two Breckenridge Grand Vacations locations that you bought are going to be good rentals depending upon the weeks you offer them for rent. In Park City, Utah, the Marriott Mountainside is also a sought after rental, but it's MFs are fairly high, because it has top notch facilities and amenities.