Sorry for the delayed response; I’m not as active on CC as I used to be.
This is one element. I’d also say that Davidson and Rhodes are a bit more intellectual and quirky and that the social scenes (especially Greek life) are a bit more chill at Rhodes and Davidson. This is obviously relative, and I wouldn’t classify Davidson as quirky compared to, say, Oberlin or Beloit.
Just my $0.02, and I’ll admit that I’m much more familiar with Duke (alum), Rhodes (boyfriend is an alum), and Davidson (I co-supervise a summer research project there) than with W&L or Sewanee.