Like Ephemera, I have to say I am Guinness, not Bud, but I don't think I could narrow down my brands of Czech beer.
I am Tom's of Maine, not Crest or Colgate (and that's fennel, mind you, with the propolis and myrrh).
I am Dr. Bronner's, not Irish Spring.
After that, it gets pretty tough. Am I Mattoni or Bonaqua? Olma, Hollandia Selský, or one of those other yogurts? It is pretty hard to think of much where I have a brand preference, although in some things there are brands I will countenance and others I will probably not. In other things, I can only think of one brand, although doubtless others must compete. Do Arm & Hammer Baking Soda, Br'er Rabbit Molasses, and C&H Brown Sugar have competitors? Presumably, but I've never heard of them.
Sounds to me like time for a dose of Becherovka.