Some Advice Please

I gradauted with my NP over the summer, took my boards and have been interviewing, where I currently work there are no positions available so I've been looking else where for a position, interviewed in December for a position working with adults and was offered the position to start at the end of the month, I accepted the position, but I was called by another facility to interview for a position to work with adults as well. Both positions are M-F 8-4, no weekends or holidays, one is a nonprofit organization and one is a private sector hospital. The nonprofit organization is a set salary with not much room for growth, the private facility is a higher starting salary and also room for increase each year. I'm going on the interview for the private facility but what to know should I accept this offer if I'm offered the position? Please some advice.