Swimming ring is a kind of toy, which is used to play with water. It has nothing to do with swimming, but its name is swimming ring. Just like an old woman's cake has nothing to do with her wife.
Swimming in a buoyancy vest is safe and reliable, but it is a little uncomfortable.
Swimming with a swimming ring is very dangerous. When paddling, the body moves forward and the swimming ring naturally moves backward. When the swimming ring moves back to your waist, the first half of your body will sink. If you don't adjust it in time, it will be very dangerous when your head sinks and the swimming ring floats. Unless someone saves you, you will drown, and hundreds of people will die every year.
It is recommended to use swimming safety belt and learn swimsuit, which is relaxed, pleasant, safe and reliable.