Are these switches, or the tone knobs?
If they're the tone knobs, then one is (as I recall) a master tone control, and the other is just for the middle pickup. Or something. Try them both with different pickup selections.
Some people never use the tone controls, but they can be handy. Set your amp a bit too trebly, then roll back with the tone control. If you then need to cut through the mix, just roll the tone control forward a little. Ta-daaa!