Trauma vs. L&D RN fields?

I want to become an RN, I'm going into the nursing program at Pima community collage, Tucson AZ after high school. I want to be an RN because I have had a fair share of medical problems and have seen how much a good caring nurse helps. either trauma or L&D. because when i was born i was pre-me. and my grandfather and aunt worked in the nursing field in ER and LnD and have told me great things what are the duties of each? and a rough pay for RN's in AZ? I know I'm a while away from becoming a nurse, I'm only a Jr. but I know i want to do it. I just can't decide on a field.