For sizes, Brecks big line is about 45-55, 55-60, 60-65. Keystone is a bit bigger, especially on the third, 45-55, 65-70, 70-78. I used my skis to measure them and then multiplied by 3...You get alot more airtime at keystone though. The jumps have similar kick but it feels like keystone has bigger Take-offs.