i'll say that not a lot of kids ski winter park/copper, so if you don't have a car, it could be tough to find rides to those resorts, but in my oppinion here is why copper is one of the best resorts to ski at.
they may not have the best cut jumps ie. breck, but woodward is now in charge of thier park, so things are continually improving. The middle size line took a while to get upto par, but was perfectly sized for getting comfortable with almost any trick
the jump line for the US open was up a good two weeks before the event, and stayed up for the rest of the season. not the best line to work new tricks on, but so much fun when you've got your shit dialed
copper may not have a park specific lift, like keystone, but there are parks all the way down the mountain to the lift line again, and riding singles never really is that long of a wait
copper may not be where the sceen kids are, but if you arn't use to being the top kid in the park, it's nice to have catylist pretty much all to your self..
not to mention copper is right off the highway, you exit, then you park. the walk to the bus is short, the bus ride to center village is short, and the walk from the bus to the lifts is short. at breck, the bus ride is atleast a 20 minute ordeal, and at keystone parking is unpleasently far from the lifts