I actually went to Cincinnati, but I know folks from nku and Dayton. From what I've heard, Dayton's program isn't so great, and nku is a better school than implied from its rank bc of its location and the fact that it has a part time program. It also depends where you want to work. For Cincy or northern ky, then nku would be better. If you want to work in the Dayton area, them Dayton may be better.
I go into both schools, but be warned about Dayton ... I'm pretty sure they do the bait and switch scholarship thing, and as a private school, they are damn expensive.