Hi moto
Neither of those guns come with the Comfortech system
I dont know how much shooting you're going to be doing, but it seems like a lot of people enjoy the recoil reduction from that feature
The Benelli website will tell you that the Legacy is about both style and performance, while the Sport II is more of a sporting gun (with the crio chokes, ported barrel)
Of course they are both based on the same internals, so I believe its a matter of taste
another consideration is the environment you hunt in
i settled on a 28in Nova for upland and trap, with a 30 inch barell you might the gun difficult in the woods
im sure someone else whos actually shot both can tell you more