So personally, according to my point of view, Samsung Galaxy S8+ is much better than this. Apple iphone 7 is just for apple lovers. But if you want a valuable phone which can give a better experience. Then definitely go for S8+ .
Iphone 7 plus have 2GB of RAM but S8+ have 4GB.
And you know that, Android is much better than IOS. In Android you can have the freedom.
So now, all depends on you. What you want to buy.
Price of Iphone 7 plus is 92000
Price of S8+ is 64900
Thank you.