I've done both west Denver and Georgetown. (and Frisco years ago before I wise up)
I wouldn't book anything that can't be cancelled till the day of. Mainly due to weather, but also flight delays. Even if Denver is clear, a storm in DC or Chicago MAY impact your own flight.
Watch the weather the morning of. Make changes if necessary.
If everything goes well, Georgetown is a good compromise. The drive is short and easy, as long as the road is dry. Altitude isn't as bad as Frisco. Has a head start over the Denver locals in the morning. That's my first choice in good weather.
(Then comes one trip when I landed, collected my car, getting ready to drive out to Goregetown. That's when my local contact, who's a transport supervisor, called me to tell me a tractor-trailer jacklifed on the interstate! Now I can't get through to Georgetown. And it's already 10:30! I ended up calling the Super 8 at Georgetown, begged that they release me from the reservation. They checked the road report, confirmed there's probably no way I could get there in decent hour. Let me out of the reservation. Nice people they always are)
West Denver avoids all that drama. And with a east coast body clock, you'll be up early anyway. So not much worry over the traffic of the locals.
Your time frame of mid-December, I would imagine the local skier traffic won't be all that bad after all.