My wife and I share 3GB on Verizon, and it's been fine with some planning. I download music at home on wifi to carry in my phone's memory. I got a wifi extender to reach the part of the house where my wife was streaming music and switching over to LTE without knowing it. We don't stream video over LTE other than brief YouTube or vine clips. We do everything else with our smartphones, like look up stuff on Google, check the weather, use Google maps, sync calendars and contacts, etc...
For us, the reliability and almost always having a good signal with Verizon has been way more valuable than the unlimited data of Sprint. After switching, I realized that unlimited data wasn't so great if you can't access that data half the time. It's easy to offer unlimited data and not offer a consistent signal. Maybe they've improved, but when I switched a few years ago, it was very worthwhile. The only scenario I could see where it's worth it is if you are not very mobile , and you have a great signal in the one place you use the phone. Like when I lived in a building in downtown Chicago that had a Sprint tower on its rooftop, and I was a resident who went to work and came home and did nothing else. I was happy with Sprint for years in that situation!