Back Acne PIH. Glycolic or TCA Peel? (photos)

Hi, I struggled with acne since I was 13 and now I'm 20. I believe I have Post Inflammatory hyperpigmentation from the old acne and I'm ready to get rid of these marks on my back. I'm of mixed race, black and white. I was wondering if my 30% Glycolic acid peel would get rid of the marks if I did it once a week for a month or so, or would a TCA Peel be better? If so what percent? I'd also like to know in case I go to a professional what peel would be better suited for my skin. Thanks!