2nd degree in Computer Sci or MBA?

I've recently been accepted into two programs. One is a BS degree in Computer Science and the other is an MBA (they do not have a computer science concentration). I work for a major electric company that is pretty much based on science, engineering, etc. I'm torn as to what degree I should go for.. I currently have a BS in Business Administration, Finance. Any suggestions as to what might open up more doors, higher salary? I'm interested in both subjects and am completely at a loss. Thanks.