bud i don't blame you for being confused
what separates the two is what the youtube gurus sell.. marc lobliner says to use 1, jerry ward says to use another. 1 sells 1, the other sells another. that is how it works
you want the truth? neither are worth your $$$. if you are eating a balanced diet you get plenty of AA's to build muscle.
if you want to spend your $$$ on a supplement that we don't get from food already, go to n2bm and grab hcgenerate. it has ingredients that are tremendous for building muscle naturally. you can PM me for a code