Masters in Finance vs MBA

Hi,

First a bit about myself:

I just started my job at a big 4 in risk advisory. This would be my first job after my undergrad where I majored in finance. I have passed FRM part 1 and waiting for the results of FRM part 2.

Now coming to where I need advice:

I’m confused as to whether I work for another 3-4 years and then go for an mba or I start preparing my application for a masters degree.

The work is ideally want to do after a masters or even an mba is get into investment banking which isn’t possible in my current position.

Thank you.