advertising on free version

I’m going to be releasing a few version of my game soon and I’m wondering what everyone else is using? I only plan on doing one full screen ad each time a game level starts unless the user buys the full version ofcourse. I’ve looked into Mobclix in the past, but either way I think that is just a portal to other advertisement companies. Would it be best to implement that into my game then just enable Admob in it? or is there another that I should use like Vungle or Chartboost.

I’ll be using Admob to display full page ads.

hello did u solved ur problem , now i am in the same situation and i don’t know what is the solution ?
to add advertisements