Verizon has said they're turning off 3G next year, it's going to be some time before 4G goes anywhere, they haven't even set a standard for 5G yet.
Speed tests can be very misleading. The path you take this time can be completely different the next time, and the next, and the next. Devices have a lot to do with it. And wireless is a crap shoot at best, so many variables with it. I'm using the AT&T Mobley connected to an Asus Router and I can consistently run over 10 meg, and for $22 a month it's a keeper. I'm pretty sure all Ubifi is doing is reselling services from AT&T or some other provider and then jacking up the price. In my area AT&T is doing the Connect America Fund build out using wireless towers, where my company is doing Fiber to the Node.