opensourcecms.com has a very nice head-to-head CMS comparison tool. Try that unless WebBoards is a commercial product.
If they are commercial, give a feature list of Moodle and ask their saleperson to do the comparison (taken with a grain of salt, of course).
Also check the Moodle Buzz database for papers.
Lounge
Moodle vs WebBoards 9.0 (academic version)
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