Someone I know who recently completed their PhD etc in psychiatry and is ready to practice… is now in a worse dilemma, which is that he feels the industry expects him to prescribe drugs for psychiatric problems, which he believes to usually be the wrong call.
Your other candidate, law, is of course also potentially full of moral dilemmas, though we need more ethical lawyers. Hopefully you’d be one of those.
Personally, if it were going to be awarded by magic rather than years of hard work and study and possibly evil loans, and all costs being equal, my choice would still depend on where my real talents and sympathies and interests and passions lay. I’d welcome official accreditation and magic skill boosts with a PhD in game theory or related useful computer science, or even computer animation.
If I can choose magic skills I don’t have to study, I might like to have a mastery of Law (I’d be damn ethical), or psychology, but I’d choose psychology because it’s interesting and useful for everything, not because I want to spend my time doing psychotherapy.
But I think everyone’s core goal should be to find their genius and do whatever that is.