Kimberly,
JomSocial's Facebook integration is very basic, and mostly just covers creating a user. JFBConnect is for a lot more integration like customizable profile imports (you select which fields come in), automatica account creation, all the social widgets (Likes, comments, etc) easily added to content or other pages on your site, Facebook Page integration, and Facebook Requests which can be sent to all of your users to let them know about new blog posts, promotions, etc.
For more details of the benefits, see the following breakdown of features compared to JomSocial's integration:
www.sourcecoast.com/jfbconnect/features/...n/jomsocial-facebook
Additionally, you may want to look at our JED listing and search for JomSocial. You'll see in the reviews many examples of users that are very happy they use JFBConnect with JomSocial:
extensions.joomla.org/extensions/social-...ook-integration/7215
Hope that helps, but if you have any specific questions, just let us know!
Alex