I'm a university student, and i travel a lot as well, my iPhone 5s works brilliantly, the only big screen phone i ever used was the Samsung Galaxy S4, but i sold it because i didn't like Android. I'm a film student so using a camera is of importance but so is portability, but also if the Plus was able to do the things my iPad does, i wouldn't need to take it into university as much, and therefore saving more room in my bag.
I'm of the opinion that the 6 Plus is an iPad for all intents and purposes. Just watch. There's going to be a rush of apps that were iPad only moving to the Plus in the coming few months.
As I've said in other threads, this thing isn't really a phone. Never has been. Even the iPhone 1 was a hand computer that happened to have a phone in it and get branded iPhone, not SafariPad or some other name. The phone part of most iPhones is probably the least used aspect of the device. So, when approaching it from that perspective the choice becomes all about usage and how the physical features of the device meet your needs.