Well, whey is primarily derived from animal milks.
Soy is from plants.
Since we evolved as meat eaters I don't think it would be a stretch to say that we absorb and translate energy and other signalling more from animal type proteins better than plant protein.
I don't know the particular amino acid compositions of whey and soy respectively, but I do know that whey contains at least a significant percentage of BCAAs which has been shown to have favorable effects during exercise and metabolism in general
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