Which is a little better, 316 stainless steel or 304 in a health kettle

All good.

1, 316 stainless steel: strong corrosion resistance, in the chlorine-containing environment can still maintain good corrosion resistance, often used in the production of marine equipment, chemical equipment and medical equipment, etc.; high strength and hardness, can withstand higher temperatures and pressures, more resistant to wear and fatigue.

2, 304 stainless steel: the chemical composition is 18% chromium and 8% nickel, with good oxidation resistance and corrosion resistance; material safety and high temperature resistance, and not easy to rust, often used in the production of tableware, kitchen utensils and so on.