id say breck is better right now. the powerline park is soooo much fun, they got like a 15 footer, to 20, to 25ish in a row, which is sweet for practicing stuff on. then a section of 4 rails, a a-frame rail, battleship, flat rail and up-rail. then like a 30-35 footer, or if you go left a dfd box, down box, dfd rail, and wall ride. then at the bottom they have a line of two jumps one like 20 ft, and one like 35-40. and to the right of that like a 40-45 with really good smooth pop. so the jumps arent that big, but you get to hit soooo much, which makes it worth it.
i like the big line at breck more than keystones just because of the last jump. the first two at breck are ok, really poppy though, the second one is wierd cause it feels very step down like. but the 3rd one is awesome, its a step-over and you can pretty much take it as far as you want and the landing will still be smooth.
keystone's first two jumps are pretty good, but the third one sucks for alot of people including me, i straight aired the first two perfect and tucked into the 3rd, and still knuckled really really hard twice. and my skis were waxed pretty well like a couple weeks ago. so i just do the first two.