6s without the plus. S7 is nothing special. When you look at iphone just oh that's the latest iphone but with S7 design you be like oh I wonder which brand/model is that. I was close to switching to S7 from 6s but after trying it at the local store fuhh thank Allah I didn't buy dat android.
If you have that much money to even considered those 2 phones, better wait for iPhone 7 tbh, moreover if you live in USA where every new iPhone would be released there soon after it's announced.
