Best return ad networks for both Android as well as iOS

Hey guys,

New here in the forum and I hope I am not replicating a question and if so - sorry in advance!

We’re developing our first game (as a new independent brand).

It’s a casual game with similar playability to Sonic Jump, which will be released on both Android as well as iOS.

The game is built in Buildbox, so I’d like to know which ad networks (with an SDK) give the best return in:

  1. Loading interstitials (entry)
  2. Popunders
  3. Video
  4. In between ads (an ad that pops every five “game overs” or so)

Naturally, if you could shed some light on both Android as well as iOS, that would be super.