Whey Protein Isolate vs. Whey Hydrolysate for Elemental Shake

QUESTION: I'm wondering which elemental shake product is better? Because Absorb Plus has whey protein isolate and Optimental by Abbott has whey protein hydrolysate. Wikipedia says that the hydrolysates are predigested, and more easily absorbed. So I'm thinking they might be better for my mom. Any comments? Well, here's what I read from Wikipedia... "Whey [...]