Should I read Brandon Sanderson's Mistbron or The Way of Kings.

I heard that Brandon Sanderson's works are really good especially Mistborn and The Way of Kings. I really want to get into The Way of Kings but the size is somewhat intimidating but I'm up for the challenge. Mistborn sounds very interesting (grim dark?) World.

I'm instead and I wanted to know if I should start reading Mistborn or The Way of Kings?