Okay, I'll bite here.
You'll find the best of these at Beaver Creek. Almost all of the trails off the Grouse Mountain lift have epic bumps. Bald Eagle trail is a leg burner from top to bottom.
Vail likely has the edge here, though the Beav is also good for getting splinters in your teeth.
Beaver Creek by a mile. If you want a steep (and often icy) treat, try the Golden Eagle run from the summit of Beaver Creek. It's the run where they hold the annual "Birds of Prey" World Cup DH and SG (and will hold the 2015 World Championships), is usually groomed, and is a challenge. Envision skiing off "The Brink" going 60mph into a fall-away, right hand turn on injected, icy snow - it's crazy! And the jumps are also quite a blast to picture, especially "Golden Eagle."
Vail has this one locked down - all you need to say is the Back Bowls and Blue Sky Basin, which encompass so much lovely terrain and spread out the crowds.
Vail's front side has 'em. Lindsey's is a classic: a rolling, former World Cup DH and SG trail that is interesting from top to bottom.
Beaver Creek also has some fun cruisers, including Centennial (the 1989 World Championship DH and SG run).
Stone Creek Chutes and Beaver Creek are probably the best of the lot between the two. If you want plentiful chutes, look elsewhere.
Vail has the better scenery, to my eyes, but both are scenic on a bluebird day.
Its just too cool?
Vail has the more tangible gravitas, but BC is the more high-roller resort of the two. The Beav allows you to ride a lift above the house of a former president (Gerald Ford lived underneath the Strawberry Park lift).
Hope this helps!
Edited by songfta - 1/3/11 at 12:30pm