Dropbox is the more common of the two in our index: it runs on 694 websites against 167 for Adobe Dynamic Media Classic, and 7 sites use both. Counts come from real scans, not vendor claims.
Adobe Dynamic Media Classic is a platform that enables customers to manage, enhance, publish, and deliver dynamic rich media content and personal experiences to consumers across all channels and devices, including web, print material, email campaigns, desktops, social, and mobile.
7 sites run both Adobe Dynamic Media Classic and Dropbox. That is 4% of the sites using Adobe Dynamic Media Classic, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.