Whats your favorite? Why is great?
I'm currently in love with All Spice Cafe's cayenne habanero sauce. Its hot but you can still taste the different types of peppers and spices in. Its got some nice up front heat with a only a medium lingering burn so you can still taste a whole meal. My (veggie) chicken nuggets are bathed in it.
Crystal is the hot sauce of the proletariat.
Pro tip: Louisiana restaurants that have Tobasco are bullshit. You know you've found a good place if they've got Crystal on the tables. Louisiana or Slap Ya Mama is okay.