Best ads for mobile game?

Hi, i’m almost done with my first game, and i have some questions about ads.
Who are the best ads for android game? I have heard about AdMob but i am reading some critics about it…
How to import them in the game?
How to add video ads which are popping up?

Unity now has a service called Unity Ads. It’s by far the easiest to implement, and comes with all kinds of great features.