Well that answers my questions Scott- I think you might be the first person anywhere on YouTube to do back to back comparisons.
The Nashville is simply gorgeous. And while I know it is hard to judge a given guitar's tone through YouTube compression and $30 headphones, the Nashville does sound better. I think it sounds a bit more compressed, or more like when a guitar is braced as opposed to an open, more loud sound found from most CF guitars.
Having said that, I also think that the 12 fret design from RainSong is a winner for them for both comfort and tone, and is also the reason I bought a Shorty years ago. Those guitars have a those same sweet and warm dynamics found in 12 fret OMs and Parlors from the wooden makers.
Nice review and than you!