A: The main difference is engine. wowslider is jquery-based, VisualSlideShow is
wowslider and VisualSlideShow provide different templates and transition effects. Also,
they use different ways of thumbnail displaying.
wowslider app. allows to insert several separate slideshows per page, you can add only one
slideshow per page with VisualSlideShow app.
wowslider app. can generate modules for WordPress, VisualSlideShow app. can not.