You people need to broaden your horizons.
Though BLT won, the final four were Bánh mì, Gyro, Pulled Pork, and the BLT.
Those were very hard choices and the Po Boy got screwed by having a bad bracket and hot sauce on it.
The banh mi is too broad of a term to call it just one sandwich. Strictly speaking, bahn mi is the bread, not the sandwich, so I couldn't vote for it even though I do enjoy those sandwiches.
The gyro is a little more specific than the bahn mi since gyro describes how the meat is cooked. Still, the term is too broad. Is it a chicken, beef, pork, or lamb gyro?
Pulled pork is a specific sandwich. I can vote for that, but it isn't a winner for me. I'd rather have a brisket sandwich.
The BLT is also specific. I do love a good BLT, but I don't think of it when I want a sammy.