Well, a couple things.
The forum "seoforums.org" (creator of FuzzySEO) uses vBSEO.
Here's a thread at vBSEO about FuzzySEO
http://www.vbseo.com/f4/interesting-...tically-40799/
IMHO, they are two completely different products. vBSEO takes care of duplicate content, rewrites url's, and tons more - while all FuzzySEO does is add some sort of search keyword cloud to your forum pages.