+1 Recoverite
I was using GNC whey protein (3:1 ratio) for years. They changed their flavoring formulation (tastes awful; lots of negative reviews) so I switched to Hammer Nutrition’s Recoverite (also 3:1) about 2 years ago. I don’t know if there is any real testing comparing 4:1 to 3:1 formulations (@ambermalika - have you seen any?), but there is certainly a lot of empirical evidence to support that 3:1 works (10s of thousands of endurance athletes over 20 years have been using Hammer’s Recoverite).
The only thing that I have read about why choose 4:1 (or greater) vs 3:1 is that carbs are less expensive to manufacture than protein and 3:1 is what is needed, minimally, for the body to absorb the protein.
@tofel Regarding Casein: following Coach Chad’s comment in podcast #187 about consuming Casein in the evening prior to bedtime due to its slow overnight absorption, I posted a thread asking other TR Forum users if they used it. The feedback was not very positive . . .