What Ad Network is the best to use? where do you get the most money out?
I didn't make much money yet since I'm fairly newly published, but I found RevMob to be the easiest so far.
I've used AdMob and Chartboost as well for the same duration as my games were published, but Revmob gave the best ECPM, PLUS it had banner, interstitial, and reward videos ALL on the same site so you only have to use one.
It's all preference, there's billions of threads explaining this