Most people aren't a pure bodytype somatotype, but a combination of the two. I'd say I'm an ecto-mesomorph. But, I don't think bodytape somatotype plays that big of a role in the effectiveness of post-workout nutrition.
I don't believe in body types somatotypes at all. I would probably be more of an endo, I gain fat very easily and have a rather wide waist.
If I was trying to put on size, I would eat directly before.. and immediately after a workout.