CG is the way to go. Graphics should be always made specifically for the story and not taken from anybody else's work.
I mean a lot of people would freak out if I would take images from another game and put different texts over it.
Beside that if I want to see the real thing I would just watch...
Ren'py for me.
I would like to see more Unity games with a real gameplay loop And less Unity games which just try to replicate Ren'py's VN capabilities.