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PRP contains a number of different cellular growth factors that help to promote collagen growth, so it is not surprising that this helps to achieve a better result. The Microneedling plus Vitamin C group did do better than the PRP group in one respect though, and that was that more of them saw a reduction in post-inflammatory hyperpigmentation than the PRP group.
The Bottom LineSo the bottom line is that if you want to get the best results for the treatment of your acne scars from micro-needling, you are better off combining it with PRP than with Vitamin C serum. However, if skin marking due to hyperpigmentation is your main worry then micro needling plus Vitamin C might be a better choice.