From my experience in making foods with tortillas the best tortilla brand is mission tortillas.
You can easily buy mission tortillas at Walmart and just about any other food store as the mission are widely available and are cheap and great tortillas.
You can also make your own homemade tortillas if you have the proper ingredients and are willing to learn how to make the tortillas.
But if not I recommend buying the mission tortilla brand of tortillas.
Other good tasting tortilla brands are Tortilla land Tortillas, La Banderita White Corn and Maria and Ricardo's Whole Wheat Tortillas.
The latortilla brand of tortillas are also great tasting tortillas.
But the very best tortillas are homemade fresh tortillas as long as you make them properly.