Tax law

Hey.
I think more than the scope, the interest of an individual matter for success in a particular area of law. Let's say, for example, I am interested in Taxation Law but I I pursue criminal law after my law school. I would not be working with that zeal or enthusiasm as compared to taxation law. Therefore, according to me, the interest mattes more than the scope as you can make money under any area of law and practice.
But coming to the question, most of the areas of law are interlinked. Let's say, avoiding taxes or not disclosing proper income would be a criminal offense. So, apart from the knowledge of tax law, you would also need to know fundamentals of criminal law in order to help out your client. There are several law firms which specialize in either of these. So, if you are not looking for independent practice, you can join these. But the scope of criminal law is generally wider than tax law considering each area of law has some intersection with the criminal law in some form or the other.