per diem question

I am currently a traveler in CA, but life circumstances (husband's job and elderly parents) may guide us back to the east coast. I am hoping someone can answer a question for me...what is the benefit (or not) of working with a staffing company vs working for a specific hospital as a relief rn? I do not want to take a travel assignment-as I will be going from NC (parents) to FL (husband), dependant on my parents' needs-so I need to have the option of a flexible schedule. Thanks so much........