Think Ginobili's a better pure scorer. Even when he was a young player, Manu had a special ability on drives where he could cup the ball, take that extra Euro-step and contort his body to convert some spectacular layups. When he developed that step-back 3, he became a guy who could take over games and then live at the FT line with what I liked to call the "duck your head and barrell into people" move.
Both have the ability to pass off the bounce, but I think Hayward will be more of a 2 in the traditional sense, with the spot-up shooting, moving w/out the ball and playing more within the offense. Of course if he turns into the next Manu I won't mind.