I'm on the last week of Rev now, so I'm wondering what to do next. This is what I've done so far, in order: Iron (YouTube), Fuel, Epic Heat, Epic 3, Max and Rev.
My favourite was probably Fuel or Epic Heat. Least favourite was Max as I got so bored. I'm thinking of doing Iron from the app next (not the new Pro one), and adding in a Heather Robertson hiit once a week for some variety. The main reason I am thinking of doing Iron is because of the length of the workouts, which are a bit more manageable when working full-time.