I like project wonderful. You can specifically state that those annoying gif ads won't appear on your site. Disclaimer: Haven't used either, just researched them previously.
Main Site:
https://www.projectwonderful.com/
Who can use:
https://www.projectwonderful.com/wecanhelp.php?id=32
Edit: Also, you can check out what bidders (advertisers) see here:
https://www.projectwonderful.com/adsearch.php