HEALTH WARNING....I am directly involved in running a pilot training related degree.
To answer your question you need to consider what type of job you might wish to take up.
For some jobs such as Chartered Engineer or Accountant, the choice of degrees is extremely limited. But for many jobs, the exact nature of your degree is far less important than the fact that you are doing a degree.
During my service in the RN I knew quite a few pilots who had degrees in subjects such as History and Geography. On one course I met a Submarine Officer who had done his degree in French. He chose this subject because he didn’t want to do the usual engineering stuff, he liked the idea of spending a couple of years in Paris, and the Navy was paying. He is now the CO of a Nuclear Submarine, where the use of French is not at all common.
The greatest benefit that you are likely to gain from doing a degree is the development of your key life skills. Having done a degree, you are likely to be far more able to deal with complex concepts, express your ideas clearly and convincingly, and plan and execute tasks efficiently. In short you are likely to be a far more employable person.
All of the above is of course based on the assumption that you actually put some effort and enthusiasm into your degree. For this reason it is clearly better if you choose something in which you are interested.
One of the advantages of the various “Pilot Training / Airline Management” type degrees is that they enable you to combine getting a degree with doing your ATPL training. This is cheaper and quicker than doing the two consecutively. This advantage must of course be balanced against all of the other factors in making your choice about which degree to take.