What are the differences between the galaxy s7 and s8?

Looking to get my love a new phone, I’m an iPhone user so I’m not very experienced with androids but he refuses to use Apple products. I want to know if the s8 is different from the s7 or is it like iPhones where they slightly remodel the screen, button placement and camera but it does everything else the same..... show more Looking to get my love a new phone, I’m an iPhone user so I’m not very experienced with androids but he refuses to use Apple products.

I want to know if the s8 is different from the s7 or is it like iPhones where they slightly remodel the screen, button placement and camera but it does everything else the same.. He said he wanted the s8 but I found a good deal for the s7, I just don’t want to compromise any features he was hoping for. What features are different?
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