Macro partitioning
Post-resistance exercise consumption of milk protein stimulates greater muscle amino acid uptake and net protein deposition compared to isonitrogenous hydrolyzed soy protein, leading to greater lean mass gains over 12 weeks.
If you are doing resistance training, consuming milk immediately after your workout (and an hour later) may help you build more lean mass than consuming an equivalent amount of soy protein. While the difference in strength gains was not statistically significant in this study, the trend toward greater lean mass gain with milk suggests it might be a superior source for hypertrophy in young men.
Our findings revealed that even when balanced quantities of total protein and energy are consumed that milk proteins are more effective in stimulating amino acid uptake and net protein deposition in skeletal muscle after resistance exercise than are hydrolyzed soy proteins.
Why this rating
The paper reports a 12-week chronic study with a tendency for significance (P < 0.11) and acute mechanistic data, but notes the chronic difference was not statistically significant for strength.
Source
Dietary Protein to Support Anabolism with Resistance Exercise in Young Men
Stuart M. Phillips et al. · Journal of the American College of Nutrition · 2005
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