MFJ vs MFS with no tax on tips, but separated.

I want to keep this short - looking for advice.

My husband and I have been separated since January after I discovered his secret spending from the last 4 years. (15k) Our future as a married couple is undetermined.

My question is, would I have a larger refund filing jointly or separately?

I qualify for no tax on tips making ~40k a year and he does not, making ~60k a year.

ETA: we do not have children or own a home or have any large assets besides a car that’s been paid off.