Dorm has a negative connotation with it. Generally used as a place to sleep, shower and possibly study. Not much else. Residential Hall/Suite is less known, yes, and therefore does not have the negativeness of dorm. Also a residence hall provides its members with a socialable community in which the RAs and Student leaders provide opportunities for fun, learning, and leadership growth through programs, funtivities, and a hands-on way of doing.
Guy: Hey I'm moving into my dorm this weekend.
Girl: Not cool, it is a Residential Hall, you have a community.