Selling my iphone 6 16 gb and want to upgrade. The two choices I am looking at are the same price: $649 $649 for iPhone 6S 128 GB $649 iPhone 7 32 GB. I heard performance isnt such a huge leap from 6S to 7, also both phones have same ram 2 gb. and big space on 6S is nice....plus i already have an official apple iphone 6 battery case that will work with 6S... But iPhone 7 is newer and will have more resale value and same price as 6S choice. What do you guys think is the practical choice?