Just curious what ad networks folks are using and which are giving the best returns.
On Android, I have been using Admob, pretty bad returns and it crashes in Xamarin Forms when you try to show an interstitial or click on a banner (https://bugzilla.xamarin.com/show_bug.cgi?id=39567). I have also tried Leadbolt. Returns were about the same and now they have ditched their native banner ad. The HTML replacement looks awful but at least it doesn't crash.
On iOS I have been using iAd which has had the best results by far of any ad network. However they are shutting down in June so I need a good replacement for iOS.
Who are you using and are you happy with them? Thanks!