Tomato Tomahto
A saying which refers to a difference between two opinions that is so small that it doesn't matter.
The saying originated from the 1937 song Let's Call the Whole Thing Off by George and Ira Gershwin. In the song, the two pronounciations of "tomato" are compared: "tuh-may-toe" and "tuh-mah-toe". When people say "tomato tomahto" they say both pronounciations, as they were compared in the song.