Mountain Biking Vail Colorado

Would you mountain bike Breckenridge, Vail, or Keystone if you are an intermediate rider looking for long runs
I have half a day of mountain biking in Summit County, Colorado (Either Breckenridge, Vail, or Keystone). I’m an intermediate mounatain bike rider and I’m looking for nice long runs, nothing super gnarly and deadly. Which resort would you ride at to get these types of runs?
I’d just go to the nearest one. If you only have half a day don’t waste time travelling.
Just pick the longest run there. When you finish it go back up and do it again. When you run the same course a few times you get to know what to expect and you can really let it fly.
Levi Vail CO Mountain Biking