I picked a major that was of interest to me and therefore that I thought I could do well with (grade-wise) - in my case, History. The good grades (plus NROTC) got me into flight school at Pensacola. So, it worked fine.
Of all my fly-buddies who were engineers, etc. They've used as much of their major as I have in the cockpit...zero.
Moral of the story would be to do what you think is practical for you and/or what you like. A happy student is going to do better.

Good luck!