Inneractive banner types. Which one to use to get highest eCPM?

Had anyone tried out which banner type gives the best eCPM?
In particular the text vs “banner” type?
Or is it the best to mix all banner types up?
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To add to m_lewi, can anyone provide some screen shots of different ads? I have never seen a plain text ad in an app.

Also what are the heights and widths of the banner and text ads? I didn’t see them in the documentation. [import]uid: 54716 topic_id: 20051 reply_id: 78341[/import]