OK,

True Protein Ion Exchange
Per 100 grams
Leucine = 11.5 grams
Isoleucine = 8.2 grams
Valine = 6.9 grams


Isopure
Per 100 grams
Leucine = 13.6 grams
Isoleucine = 5.4 grams
Valine = 11 grams


I'm not praising one brand over another, just trying to get to the bottom of it. If it is just about BCAA's then it all doesn't make a huge difference. Isopure has more leucine (and valine) but the numbers for Isopure were rounded up so it has only a few grams more total BCAA's. In any case, in terms of BCAA's, I'd say go with the cheapest. Disregarding price, in decent brands, I think the BCAA content is all going to "even out in the wash" for the most point.

However, Isopure is enriched with L-Glutamine, if that makes a difference, since the Ion-Exchanged are only going to have gutamic acid any other way. As far as I know it also contains a bunch of minerals (including trace minerals). This may not be desirable for a post workout....

Here is the BCAA profile for my regular whey for a comparison, which, imo, is a pretty typical product:

Per 100 grams
Leucine = 8 grams
Isoleucine = 4.5 grams
Valine = 3.4 grams

P.S. I see what happened now. Those numbers for true protein were the grams of BCAA's in 100 grams X 2 instead of divided by 2.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.