Hard question to answer as its based on where you are.
Verizon may be crap in your area and Boost may be good. Or Vice Versa.
I have played with all the carries in a number of areas and in each area there was a different best service for each.
Not the answer you were looking for I am sure.
I tested Boost here in CT and it was Horrible. I used the same device in Springfield Mass and the speeds were amazing. It all depends on where you are, so again a very very hard question to answer.