For vinegar, I don’t taste much of a difference between brands, although color is important. Dark vinegar, or “Chen Cu” 陈醋, is the standard in China and the famous ones always come from Shanxi province 山西. While cooking with a very experienced coworker, I learned that a particular brand is famous here: Dong Hu, literally East Lake brand. You could search for it, but I’m not sure if it is available outside of China.
Medicinal benefits: A study has shown that putting vinegar in the food you eat can increase satiety, which leads to less food intake.[*2000] This is a great natural benefit for people fighting obesity. Other potential benefits include fighting infections, but there are other things out there which are more effective.
Apple (cider) Vinegar is a common drink I see in supermarkets here. Some studies have hinted that it could help with conditions such as diabetes and obesity. Maybe you should get a bottle and try sometime. Shake things up a little!