I'm biased because I'm not normally a comic reader, but based on the selection provided in Arcanum, I prefer the prose version. I do think White Sand was a good choice for a graphic novel because the magic system is so visual.
I've been enjoying this so much. I hadn't read a lot of the material included, including the previously published things like Mistborn: A Secreat History and The Emporer's Soul. That last one may be one of my new favorite Sanderson works, I read it in one evening and was so immersed in the...