City library page or County library page?

Hi, asking for an advice. I currently work as a page in our city library (1 month) and just this week I was notified that I passed the exam and was referred for interview in a county library for a page position as well. The county gives financial stability and offers benefits, I currently work 16hrs a wk, nonbenefited position but my job and my coworkers are amazing.

Would it be a redflag if I will let the interviewer know about my current job in a city? Though if I will be moving forward they will see it thru background check. What is the best way to explain the reason of attending that interview when I currently hold a job in a city library? Thank you all.