[product question] Is lactic acid better than glycolic for fading PIH?

Beauty Tips For Body Care
I have to pick between The Ordinary’s glycolic acid toner and lactic acid. Which is better for fading effectively my PIH? Also which concentration is better for someone that has never used chemical exfoliants? I heard that the 5% isn’t that effective but other people say that the 10% is too strong. Thanks!
Girls Blog 2015
Submitted by usernameeee_