Really depends on a few other factors:
- amount of scholarship opportunities for FT vs PT students. Full-time students usually have more student assistance available to them and can be pretty key - I got about 60% of my Masters paid by institution issued scholarships and the rest from internships.
- The difference in tuition between FT and PT. How much more expensive is FT?
- If you did PT, what type of PT job would you get (manual labour, retail, admin etc...), how much you'd work per week, and what pay you would get. If it wound up being a minimum wage job, you might find your time commitment to the PT school + PT job about the same as a FT education commitment. On the other hand, if your part time job makes a good wage, that buys you more time.
At the end of the day though, beyond just the money and the time - it's what you think will make you the happiest. Full-time schooling also does offer time off - there are spring breaks + reading weeks + long weekends + quiet exam periods too!