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I havent actually used Mambo but I can definitely say that the Dreamweaver extension for XOOPS is much more user friendly and functional than the extension available for Mambo. If you are planning to use Dreamweaver to edit/create your theme/template, the extension itself is a good enough reason to use XOOPS. In my very humble opinion, of course :)
www.myxoops.com - MyXoops Is Your XOOPS!