The effective edge and sidecut radius are things not nearly as important as board width and overall length, a very experienced snowboarder would be picky about those things.IMO, I think Rossi boards last longer than K2. K2s are very fun rides, but might not be a coincidence I have busted every one I have ever owned.The Legion is a nice board too. The build is not much different, but a bit more freestyle oriented (centered for ease of switch riding and quicker turning).