best ads provider for android/ios

Hi guys,

I’ll release my game at beginning of September, and i want to know about other users experiense with ads provider. For now and i just run my game at few devices I’m using admob. I would like to know about chartboost  if that is good for example to use on ios or vice versa, or it for ios its better to use apple ads, instead admob.

Can any of you help decide this?

Thanks