I have both products.
Frontpage Slideshow is good for joomla sites but simply does not work with Vbulletin 4, or maybe you should be expert in coding to make it work.
support there do not understand absolutely nothing about vbulletin, they have one answer for all vbulletin users questions:
read instructions and put the code in index.php.
( they ignore that vbulletin does not have any index.php)
vbslideshow is extremely easy to install, with many nice effects, but the most important is support, they have really a very helpful support team . persons who undestand how does vbulletin works.
sorry for my english.

أنصح الإخوة باستعمال vbslidshow
و الإبتعاد عن المنتج الآخر لأنه يخلق مشاكل لا حصر لها مع المنتدى، كما ان الدعم في
joomlaworks
ضعيف للغاية و سيء جدا