Rowlett local here, and I have to say I concur with the above statement. I lived in Garland for 12 years and one of my Airbnb's is in Garland so it will always be special to me but as far as growth goes there is nothing special that makes it stand out above its neighbors. You could possibly do well in the Firewheel area of Garland which is close the a large outdoor shopping mall/movie theatre/bars but other than that it just doesn't appreciate well enough for me to invest in. You would do better off looking at places like Wylie and Sachse that are seeing a huge growth right now and south of the Metroplex in areas such as Waxahachie, Midlothian etc which are also seeing a huge housing boom.
If you want to hit some of the outer suburbs areas such as Royse City, Fate in the northeast and Crandall/Kaufman in the Southeast part of DFW. I'd stay away from anything West as far as entry level goes. Most of that has been developed, overdeveloped, and developed some more.