vbindex has a built-in shoutbox. vbadvanced doesn't.
vbindex has collapsible boxes like vbulletin, vbadvanced by default doesn't.
vbadvanced has good modules for integration with v3 articles, vbindex (to my knowledge) doesn't.
vbadvanced has an easy-to-use weather module, vbindex (to my knowledge) doesn't.
If you want to see two examples on the same site (and you're quick about it), you can see vbadvanced cmps at
http://asiansinc.com
And you can see vbindex at google's cached version of that page:
http://216.239.41.104/search?q=cache.../+asians&hl=en
Hope this helps.