And the answer is
According to Thomas Crapper, the inventor of the mechanical toilet, the answer is:
Large button for "one", small button for "two."
Or, according to my Fifth Grader, "Blue for poo."
you failed!
Why didn't you answer the question?
She wanted to know the difference between the two buttons' functions.
You simply returned with prejudicial discourse on "big boxes."
You either (a) didn't really know the answer
(b) just wanted to show your lack of preference...