That’s an interesting question. I think you’d be better of with video ads, as you won’t risk seriously damaging the user’s experience and app trailers are actually engaging and not only annoying. Also, your research is about right, video ads will usually have a higher eCPM- as long as the fill rate remains high.
At Supersonic, developers average between 5-9$ eCPM and our mediation platform supports all major ad networks including admob, chartboost, adcolony, airpush, etc. so your fill rate is maximized at all times.
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Hmmm $5+ for video ads would definitely make them a better contender. I’ve also checked out surveys. Pollfish (https://www.pollfish.com/monetize) advetises a $.30 pay off per completed survey. Has anyone had any success with this? A $300 ePCM makes them the clear winner if I was to implement them every 25 levels.