I used both the iphone 7 plus and Samsung galaxy S8 plus. And I think.
1) For battery standby iphone is best
2) For battery screen on time iphone is bad and galaxy is good.
3) For speed iphone is better but no one buy a phone because of speed. But galaxy is still good.
4) Iphone doesn’t hangs but galaxy hangs sometime.
5) For connectivity galaxy is far better.
6) Display of galaxy is awsome.The curve display is next gen technology.
You should buy galaxy for your user experience but if you want to show off then buy iphone. I think the logo will help you to eat it when you will hungry.