I couldn't decide between aviation and engineering degree. I ended up with an associate degree in aviation and ratings through commercial and CFI. Then I went for the engineering degree (mechanical) while flight instructing. Not a lot of student activity at the time so I got a job as a controller continued to flight instruct and finished my BSME. Never officially used the engineering degree but I'm glad I have it. I've found it a huge advantage when it comes to understanding aircraft systems and aerodynamics. I love it when I have a student with a technical background.