Rose Gold.
I found my S7 really laggy and just not as smooth as iPhones. I also own a Macbook & iPad and just like everything to sync up together nicely - it was a hassle to move things from S7 to my MB and with uni starting up again, I just wanted to simplify things.
I also prefer iOS to Android N - I don't need all the customisation options, it was overwhelming and the basic skin(?) that comes with the S7 is UGLY. There are a few things I'll miss about it, but it's not enough to keep it cos there are more things about the iPhone that I miss too.
Also, I didn't wanna pay extra to get the iPhone 8 just for wireless charging - didn't really see a point in it.