ATL-DFW is a very busy commuter route. DAL used to have a base in DFW and there are still lots of people commuting to ATL from there.

I'm not an ENY hater, but if you're shopping for a regional and you live in ATL I'd go with a company that has a ATL base. I don't know the DAL carriers that well, but there must be one. Nothing beats driving to work.