These sites are VERY different from eachother so it totally depends on what kind of cammer you are and where your strong parts are.
I am a person who is highly sexual, has fairly unreliable schedule, hates talking to people while offline so streamate has been my camming home for awhile. I like that I can just log on, get a private show,get dudes to fap and log off. No countdowns, creative shows, reliance on regular members or coming up with games.
On MFC, being creative, consistent, willing to connect with viewers even on your off-cam time are coveted skills there. There's more emphasis on personal connection VS just banging away at yourself with toys then having the guys move on afterwards (Which is what I prefer lol).
I will say this: MFC is the hardest cam site for first timers. I'd recommend chaturbate over MFC if you want to do a token site,get used to performing on cam with a bit more wiggle room in regards to camscore/ranking and then try MFC when you're more prepared.