I would like to place my votes on Nitrogen Sports and Cloudbet as those were the only ones I have tried so far.

Nitrogen Sports: 4
Cloudbet: 2.5

As Nitrogen gives you SO MUCH GREATER odds, it loses a lot to Cloudbet by just allowing live bet on very specific events (at least that was the way it was in the start of the year).

Cloudbet loses a lot by the odds and the terrible support, unfortunately. Cloudbet even has more sports, but unfortunately, in the end it is not enough.