Honestly I think it all depends on your personality and what you want to do.
If you don't mind shoving dildos inside you 75% of the time and do not want to spend time building a "fan base" go Streamate.
If you like to chat more, be entertaining, and do not mind putting time into building your regulars, go MFC.
I wouldn't know about the other websites as I have only worked with these two, but that's just what i observed.
I personally make more money in less time on SM, but being on MFC is a nice break while still being profitable. Just my 2 cents.