monetization v ads

I've been playing around with ads. So when I use the advertisements library, all my ads work great, when I use the monetization it won't call the ads in real game, only in the editor (have tried both ways in multiple builds on both Android and iOS). My only real question is, does it matter. I have the newest library (3.0) installed and set up, so does it really matter whether I use UnityEngine.advertisements v monetization when I actually run my game.