not power point

Awhile back there was a thread in which some folks said they use powerpoint to storyboard, because that's the way they can work best with SMEs--SMEs can make changes because they are used to powerpoint, etc. My question--if it's so useful to use powerpoint for the prototype/storyboard (then integrate it into Lectora), what's the advantage of Lectora over a powerpoint-based authoring system like Articulate? (I'm making a purchasing decision.)Thanks for your opinions