They are both pretty quickly digested, Surge Workout Fuel will indeed spike some insulin and keep it elevated during workout.
that and it should help keep protein synthesis up during the workout. You can do Surge Workout Fuel before and during then slam some Surge Recovery after. I believe hipscar does that.
I always liked Surge Recovery, but I would drink some before, during AND after when I was on it. Now I just use Surge Workout Fuel.