I have the IPhone 6s Plus but I want to upgrade it should I get the Iphone 7Plus or Iphone 8 Plus?

I have the IPhone 6s Plus but I want to upgrade it should I get the Iphone 7Plus or Iphone 8 Plus?

Read more: I have the IPhone 6s Plus but I want to upgrade it should I get the Iphone 7Plus or Iphone 8 Plus?