We've occasionally done the fast food breakfast but I wouldn't say that we have a particular brand loyalty; most of the time the choice of where to buy a fast breakfast will depend on which franchise is closest followed by what we are in the mood for, because while similar each chain has something unique and each chain has it's own sort of flavor profile, as well as whether or not the local franchise has a history of sluggish service or errors in the orders.. I would have to say though that McDonalds does tend to claim more of our breakfast dollars because of their menu items and as far as Taco Bell is concerned I just can't picture them as a breakfast option currently and their franchise is a bit less ubiquitous than McDonalds Or Burger King and I can't imagine specifically seeking it out unless the breakfast was really killer- and the fact that I would have to seek it out in the first place to even try it means we'd need a special circumstance for me to be at their counter in the morning.