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.
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.
We rest Mouth Wash vs Warm Salt Water to share wise words from antiquity:
Today is: 20th January (GMT), in history on the 20th of January, 1801 AD the following event happened:
John Marshall appointed US Chief Justice