Dallas meh, the downtown is weird, after the 9-5 crowd is done work it's honestly a ghost town in the downtown area, the whole Dallas-Fort Worth area is huge so maybe it has nice pockets, if you ever get lost and find yourself in Texas just get to Austin as fast as you can and you will love it, lots of music, galleries, bars, lakes (not much of Texas has water) and friendly people that are mostly transplants from all over the place due to Austin's cheap living compared to most other large cities.
To give you an example this is my buddy laying down in a downtown Dallas street equivalent to Toronto's King/Spadina area at 6pm on a Friday lol
http://i.imgur.com/BIfMoLR.jpg