i have skied summit county vail and steamboat and have also skied alta and brighton and PC. although i come from the east coast i still know that brighton and alta get dumped on and are better than PC for pow. i dont know the canyons but it sounds good in comparison to the colorado resorts because of its size.
also since you ski keystone and breck you know all about liftlines. to escape the lines ski brighton. just look it up and dont just look at PC and canyons.
i had to make this same decision this year and i chose alta and brighton and skied PC one weekend.
(ps if you are out west or especially in utah ski some pow we dont get that shit out east and trust me utah has some epic pow even in bounds so take advantage of it )
pm me if you have questions about alta and brighton