I lived in a two story modular home in Maryland for 3 years. I was a little leary at first cause all I could think of was "trailor". But boy was I wrong. This home was better built than any "stick built" home I have owned. The walls were thicker, the insulation was better, the home was more sturdy and soundproof. The standards were much better than those put into my current "stick built" home. Those homes travel miles over bumpy roads and are put together on site. You know they have to be good if they can withstand that.
Before I bought that previously owned modular, we priced out brand new ones. If I remember correctly they only needed 2-3 months to ready the site and put them up.
So from someone who has lived in 3 brand new stick built homes, 3 previously owned homes and one modular, I would pick the modular. It was by far the best of the bunch.