Which is better, a part-time job in my field of study, or stay with my current full-time job that's unrelated to what I studied in university?

I currently have a full-time job, and I'm a month away from getting the medical benefits. However, I might have a part-time job offer coming up that's more related to what I studied in university. Should I stay with my current job until a full-time job in my field of study comes up, and then that way I can get the medical benefits of my current job? One advantage to the part-time job is that if I go back to university, the part-time job wouldn't get in the way. Other than that, I risk starting a new job that won't give me medical benefits, and they might even find after they hire me that I'm not the right fit for that job (lots of customer service, and I'm an introvert).

Which is better, a part-time job in my field of study, or stay with my current full-time job that's unrelated to what I studied in university?
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