You can't be serious...
Cool, you enjoy your S8....fine. Cool, it has a lot of innovative features...fine. Cool, you were bored with iPhone...fine.
But the iPhone is WAAAAY faster than the Samsung phones... TouchWiz, more like LagWiz. It was HORRIBLE on my friends S7 Edge and I just had a relative get an S8 Plus and the lag is still there. And no, they aren't lemons. I personally owned three and I moved to iPhone starting with the 6 and I've never looked back. It's just not for me. What you get in features is not making up for the lag, stutter, and overall hiccups of Samsung's twisted version of Android (which is already poorer in resource management). Even those 2 second lags add up over time, costing you either productivity or just annoyance when you are trying to just mess with your phone for fun and entertainment. It matters. At least it should.
The S8 may have more features and everything, but the iPhone is still by far the fastest phone, and you can thank iOS's optimization and the sleekness of the operating system for that. iPhone has less RAM than most top tier androids and yet it smokes them in terms of buttery smooth performance. It is really not even a contest. Go with iPhone if you want fast.
The S8 is a great phone, but it DOES still lag, even more than a Pixel, which is by far the fastest android phone (still not iPhone level of speed but close). But Samsung and speed/fast don't belong in the same sentence. Just no. Please no.
I'm sorry, but I call it like it is.