I ride both and love them for their differences. When I'm tired I ride the Byerly, it's more forgiving. When I want to launch I ride the parks, because it will. BTW, there are lots of other manufacturers out there, check 'em out.
I just bought the 05 parks. Tested it out a couple weekends ago and loved it. Upgraded from the 2003 parks. They've made it a little more forgiving but it didn't lose any of the pop. Test'em out...and ya, i recommend checking out other companies to. You won't really appreciate what you have until you've tested the competition.