Honestly, I don’t really think Braggs is much better than any of the other premium unfiltered apple cider vinegars. One that I purchased from a local Canadian producer was actually better than the Braggs (especially for drinking). The commonly accepted rule is that it needs to have the mother for best results.
Honestly though, the first acv vinegar I tried was just a regular cheap Heinz and it worked just as well for me topically. I believe, it’s just the acidity (specifically malic acid) that kills bacteria. For drinking though, the premium stuff has a much richer taste.