I rarely use either one and have perfectly healthy teeth and gums. I believe in cleaning from the inside rather than the outside. A diet, like one rich in fruits and veggies, that rids the body of toxins and supplies nutrients to your gums and teeth so they can fight off disease all on their own.
Thoughts on reality : The trouble with having both feet on the ground is that it brings one into unbearably close contact with the world. Thomas Szasz -"Heresies"
Mouth wash is much better in killing bacteria and more effective. Warm salt water is good when you have some bleeding and nice to have cleansing.
I think both saltwater and mouth wash work, however, I would think that saltwater would be less effective as it's not specifically designed for rinsing the mouth.
We break from Mouth Wash vs Warm Salt Water to share interesting fact from days of old:
Today is: 5th June (GMT), in history on the 5th of June, 1957 AD the following birth happened:
Jim Woodward: Wilmington, Delaware -- Nike golfer (1994 Miss Gulf Coast-50th)