What is right for me... AHA or Retin? Red marks from acne?

I had bad acne at 15 and at 16 all the red pimples had gone, and I'm now 19 since 16 I had red acne marks left and now they have gotten a lot better although I never treated them properly at first as I used different treatments on my face etc bp and sun exposure. However my marks gave gotten really better now but would just like to have them gone now, I've been using aha for about 6 weeks , I have read that retin is better at fading the marks? I will upload pictures wen I can at work at moment.

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