Nursing or social work?

Hi. I am intending to go to university to study either nursing or social work. I am not sure which one to do. Nursing is my first choice right now, but social work is also on my mind. Which one pays better and which one can i find a career in more quickly?
Also, i havent studied health and social care so far at a levels so will law, psychology and sociology be enough for the nursing degree or maybe the social work one? HELP please!!!