While I'm not a fan of the relative lack of topography (aka flatness) of DFW, I do like that you can see so many skylines from so many areas. For instance, when driving in the Lewisville/Carrollton area looking east, you can see a massive number of towers stretching from north to south, beginning at the Star in Frisco and ending with DT. It's prety impressive, actually.
That said, I think Dallas and Houston both have some older bones that Austin simply doesn't by virtue of most of its real growth being relatively newer. I'm not one to play city vs city....but obviously Austin wins.
jk