I had 6 Plus for a year, switched to 6S recently and I definitely miss the larger 1080P screen and the amazing battery life of the 6 Plus. I think you should get a 6 Plus. It has no performance issues and works like a charm.
You can get additional features like RAW format images and stuff through jailbreaking. Its entirely upto you though. Some people love to jailbreak while others don't find it too appealing to go through the hassle.