If you haven't purchased anything yet I would use the Bad Ass.If you already have the Scorpion use it. If you have both use the Bad Ass.The Bad Ass has better bearings, the rest is too close to call, so that's the deal breaker for me. I am running that exact Bad Ass In my son's Genesis Extreme with a Cox/Ressinger 3 blade 11x5.5 without issues so I know it will swing most props up to that size without issue. The Bad Ass also cost less. This is only if you plan on using a 6 cell cell set up. Like John says things will be different if you plan on a 5 cell set up?