Is iPhone 6 Plus worth the extra $100?

Is iPhone 6 Plus worth the extra $100?

Added (1). I bought a used iPhone 6 Plus with 128gb storage off-contract for $600. I love that phone and the size and everything about it but I now got a great deal on a 6 with 128gb storage for $500 off-contract (I'm using prepaid with my carrier so I don't have a contract). Should I sell the iPhone 6 Plus or the 6 before the new iPhones come out in September? I love the Plus but at the same time I spent $600 on that phone which is almost as much as my monthly rent.

Your rent is 1 month, but the iphone can be used years before trading it in (and then you get money back.