I can't in good faith recommend anyone go into computers who's looking for an interesting and challenging career. The number of awful jobs is high, and the number of good interesting jobs is low. Plus, if you're starting as an adult, it's too late. It's either something you've been doing for a decade, or you're gonna have too far to catch up. If you've been more than a geek, and have been studying programming all along, then that's different . But a computer science degree doesn't really apply in the real world anyway, it's just a foundation.
I can't imagine that accounting will be more intellectually stimulating than banking. I'd find other finance fields if you're looking for challenge