If you could never countenance acting for the wrong side in a legal dispute, you may find the law a difficult profession. It is not the role of a lawyer to judge which party is right or wrong. That is the role of the Court. Even the worst people have the right to be represented. The lawyer's duty is to do the best he or she can for a client within the limits of the law and professional ethics.
Family law involving wealthy people is about property and children. Family law involving non-wealthy people is about children.
The former is well paid. The latter is badly paid. Any case about children can be emotionally demanding.
Firms doing family law tend to do either rich people stuff or poor people stuff, not both.
Most criminal practice is not very well paid, whether prosecuting or defending. Defence work in business crime can be well paid. Criminal law is interesting to study but can be humdrum and/or depressing in practice. It can be emotionally intense.
Litigation of every kind is an intellectual contact sport. Being any kind of disputes lawyer requires personal resilience.