In my opinion, I think that an airline would be more interested in someone that kept on flying after it s training (it could be as an instructor or wathever available to raise experience) rather than someone that completely changed of career path by starting uni.
Don t forget that the two most important things in aviation are motivation, and experience. Changing a career path after training shows that aviation is not a priority for you. On the other hand a degree would be a very good back up plan in case things don t go right for your pilot career. I advise you to do your degree before.
winch