I know it can be confusing, but here's the simple version:
Natural cider vinegar has lots of good trace minerals & nutrients. A small amount added to foliar spray rounds out the feeding. Hence its inclusion in Garrett Juice.
White vinegar is less nutritious but still enhances the soil when it is sprayed because it helps to adjust the nutrient balance on a chemical level; however, this is not regularly recommended because of the potential for burning. Vinegar comes in various levels of strength, usually 5% for regular household use, 10% for pickling and 20% for more industrial and serious weed control use.
Do a little general searching on the net and the differences will become more clear to you. In the meantime, I hope this clears up the confusion.
Now, you wanna talk about corn meal vs. corn gluten meal?
(That's a joke...for those new to the forum, it's a constant source of confusion). Hope that explains it, clherv. I'm not making fun of you, just having a little fun here. Let's never take ourselves too seriously.