This topic title shows a significant amount of bias.
NwN or SCL? NwN of course.
But you might want to bring this topic to their forums, not this one.
Yet, this is by far the best solution I have to give my D&D campaigns to the players in a visualized form.
I'd say RPG campaigns instead of D&D.
SCL lacked the content and a decent editor, NwN is cool if you want D&D or a mini MMO.
Looking for a VTT?
D: OS2 is your game of choice without a doubt.