Dantes tests seem to be worded more...unintuitively. It almost seems sometimes that they're just trying to trick you on the dantes questions as opposed to the more straight forward clep tests. Also, clep is now computer-based whereas dantes is paper-only. Overall though, I think they're of similar difficulty.

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CLEPS:
Social Sciences and History
College Math
English Composition (no essay)

DANTES:
World Religions
Civil War and Reconstruction
Drug & Alcohol Abuse
Management Information Systems

Excelsior:
Organizational Behavior
Ethics: Theory and Practice
World Conflicts since 1900
World Population

All done! 42 credits by exam