I'm a realtor. I took a 4 hour class to learn the difference between modular and manufactured. A modular home is built to the same building codes as stick built. In my area, it is BOCA code. In other areas, it can be a different code. Manufactured homes (used to be called trailers prior to 1978) are built to HUD codes (less stringent). Modulars are built in a factory, so that there are no weather issues (warped floors due to rain). They can be customized to suite you. One story, two story, Cape Cod are all options. There is a subdivision in my area that is all modulars. One of the advantages is how quickly they can be installed and ready for occupancy (30-60 days for modulars and 4-6 months for a stick built). I don't see a downside for you. They are the same as stick built.