mental health nursing vs medical social work?

Aside from the obvious big pay differences, what is the difference between case management or mental health nursing vs mental health social work?

I want to go into mental health and not sure what route to go. Everyone suggests psychiatric nursing due to better pay and more options.
What's your background? Are you a nurse now? What is the employment outlook for each of these choices? You mention a pay difference - how much does each one average? Check the US Dept. of Labor's info on these questions as a starting point. Best wishes.