If Intertops offers MMA betting I would say stick to them. Haven’t heard a lot of good things about other sportsbooks but Intertops is solid.
Regarding MMA bets I love MMA in general and there always seems to be an unusual history of upsets that happen all the time. Picking the favorites isn’t always as profitable and you have to make a good judgement on the true odds for each fighter and compare it to the price offered. Most of the time you can go against the public to find the better deal. An example being Frank Mir versus Brock Lesnar. The public jumped on Lesnar so he became a big favorite but the price was too good for Mir.