Being an executor can be stressful, mostly because the process of administering estates and releasing funds takes time. The solicitor who prepared the will would be doing the administration and would be guiding you through what's involved. The best way to avoid stress is if your parent leave a written summary of where all of their assets and loans are and have their paperwork in one place where you can find it.
If your brother and yourself are the only beneficiaries, it would make sense for you to be the executor. As he lives abroad, there would be tax complications if he were to act as executor.
As an aside, there should be two executors as a precaution in the event that anything should happen to you. Your parents have probably been advised about this but you might mention it to them.