LaTeX is good. No one will object.
Since the industry standard in math is currently some dialect of TeX for producing PDFs, there's certainly no harm in learning how to do this, or in doing it.
Indeed, for upper-division math, certainly for graduate-level math, and absolutely for professional academic math, do not try to get by with whatever kludges "Word" offers. It just does not work as well (at least for the time being... who knows what the future holds?)
Even if one might reasonably claim that details of formatting don't matter too much to actual mathematics... first, they kinda do affect readibility... second, deviation from current standards both impedes readibility and makes one look like an outsider.
In particular, I'd think your instructors would surely tolerate "Word" documents from lower-division undergrads, at some point they'd recommend switching to (La)TeX. To get one's foot in the door, a certain amount of conformity can be helpful, as otherwise-meaningless as it may be.