Have done the Windward a few times, north and south but the Mona I have passed north and south of but never through.
I would consider a few things making the decision. Is the forecast
for winds from NE, E or SE? What strength?
If strong NE winds I hear the Mona can be a bit bumpy but at the same time the south coast of Hispaniola you could be becalmed if close in. Also the Windward would be a slightly longer route
and likely some southerly current
to slow you down.
Unless the conditions in the Mona were really bad I would go that way.