Yes lines at Breckenridge are terrible. Probably the most crowded mountain in the state.
What is best depends on priorities. Budget, type of terrain, other amenities, access, crowds...
The summit County areas and winter park have great skiing, easy access from Denver but most crowds. Steamboat is doing a major expansion and upgrades and their crowds have gottenbig too. After Christmas spring break is the next busiest time.
Aspen/snowmass have much lower crowds but further from Denver and higher prices. For example.
All the major ski resorts have plenty of great terrain. You need to prioritize crowds vs budget vs accessibility. That will help you narrow it down.
Also know you will save a ton of money buying ski passes ahead and soon, usually before skiing starts will cut pass prices significantly.
Edited: 1 year ago