Just for my 2 cents, went through the same process and ended up with 6 plus and couldn't be happier. For me, the screen size and battery life are more than worth any size issues.
I used to carry around multiple battery chargers due to the horrible battery life on my 5s. I realized this past week, that I have basically stopped using them when I'm out and around on a daily basis, because I just don't need them anymore. That's an awesome change. I can go out with 20% battery at night to dinner for a few hours and be fine. With my 5S I could barely make it TO the dinner before it would be about dead.
I have two other brothers that both went through the same decision tree, really struggling to decide. One got the plus and is happy as a clam, the other got the regular 6 and after about a month has already decided he should have gotten the plus. He needed that time to get used to the size of the 6 and then realize that the plus would be fine.
If you have only one choice, I would say get the Plus. But it's really a difference choice for everybody, pending what they value more.