Our Texas chains a pretty good. Whataburger has been nerfed a bit since a PE firm bought them, b,ut they've still got half a dozen specialty menu items that are really good and regionally tailored.
Taco Bueno is one step up (but probably only one) from Taco Bell, but again, it's about being regionally tailored. It's pure Tex-Mex, with chili con carne available as a sauce, focusing on slightly chunky salsa roja, seasonal tamales, etc.