I had a 6 plus and i worried about whether or not i had made the right choice. So, two years later, when the iphone 7 came out, there was no question i'd be going with the plus again. Myhusband and daughter both have iphone 6, not the plus, and their phones seem so tiny now. I know as long as there is a plus version, that's what I will be ordering. I could never go back to that smaller screen now. The large screen, better battery life, faster processor, the plus is the superior choice in my case.
However, if you must carry your phone in small pockets, I could see where that might be an issue. But again, for me, the larger screen size more than makes up for that.