Be prepared for Brecken-fridge, it can get downright cold in January.
The wind is pretty fierce up at the top of Breck, if the Imperial Express lift is running and the wind is blowing, you could be getting fresh tracks with every ride, or you could be getting zero visibility and ice. It's a crapshoot.
Not a fan of Vail, great variety of terrain, but the parking fee gets me every time. Oh, and the free parking at Breck is as far away as Siberia.
Breck's dining / drinking options are second to none, it's a pretty town, especially once you go east of Main Street into the residential district.