With a child on the spectrum, Holden is a good bet. He'll get better services through the Wachusett school district than through Worcester. Worcester schools are fine but if I had an impacted child I'd prefer to be in Wachusett. Wachusett might have more opportunities for gifted students, but, the kid is 4. Talented in 'music, computers, STEM, and maps/geography' at 4 years old sounds a lot more like a parent over-embellishing their first born than reality. Either way, Holden is a good bet.

I am not asian american but Holden is fairly affluent and welcoming. Most of MA is, really. As others said, Worcester has a decently sized Vietnamese population and Worcester borders Holden; might be able to find some community connections that way. Again, with a child on the spectrum I would opt for Holden, but depending on where you live in Holden everything in Worcester is a short drive.