What is the Difference Between Indiba Vs Exilis Vs Thermage?

I have been doing quite a lot of research about this three machines. As i know they are all radio frequency, but some of the friends of mine tried Thermage claims a bit pain during treatment. Why is there pain? I personally quite confident with Indiba because of the result are excellent. I wanted to try Exilis but not really confident about it. And i wanted to have must breast more firming, eventually when i went for consultant, a Dr. suggest RF but aren't RF is heat?