Given the similarity of the S8+ and the S9+, is there any difference in the Otterbox Alpha Screen? The S8+ screen is 1/3 the price of the "S9+" screen.
gazuga is right. the dimensions are slightly different. it might not have mattered on other phones, but S8 and S9 have curved screens. As such, the protector wont fit perfectly, leaving a small gap between the protector and the screen, which dampens the screen responsiveness.