A cookie? I think I'm failing to understand the concept here... Does this site use lots of cookies or is this something else we're talking about?
As for whether I enjoy Mistborn or Sa better, here's the deal:
I must admit I'm partial to Mistborn because I read it first, but I also love it because the character development is unlike anything I've ever seen (at least in the first trilogy), the magic system is overwhelmingly intense, exciting, and complex, and the plot sequences, large and small, are profound and enthralling.
Where Mistborn lacks in culture and worldbuilding, Brandon seriously outdoes it in SA. The lore, language, customs, appearance, religion, and social systems of the various countries on Roshar are amazing. I believe when Brandon is done with the series I will love it more, simply because I'll understand the magic system better and because the characters will flush out a little more. As if they haven't yet already haha *clears throat at Shallan and Kaladin*