200 calorie surplus = some mass gain.
500 calorie surplus = greater mass gain.
The extra 300 calories will result in additional gains in lean muscle mass, but also in fat mass. All you can do is experiment. If you want to gain muscle mass and are not concerned about some fat gains, go for the higher surplus. If you are sensitive about fat, go for a smaller surplus but understand your muscle mass gains will come more slowly. It's all about your goals.
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Hunter
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