As an ad network, you want your ad server to help you manage publishers and advertisers. You want it to serve ads on different mediums simultaneously. At least this is what we were looking for, and Epom serves our purpose beautifully. One thing which I like the most is that it is a feature-loaded ad server that offers real-time ad campaign data, and allows us to build reports. It has a comprehensive collection of reports. Highly recommended!
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It might not be an ideal pick for you if you don't want to explore all its features. It provides a comprehensive range of functionalities, and I feel it would be an injustice if you don't employ them all.