AHA Exfoliation: Comparing Percentages

Hello, I was wondering, is it better to use an AHA product with 5% glycolic a few days a week, or should I use a 10% glycolic product once a week? I use SPF on a daily basis and a retinol serum at night. I like AHAs for the brightness and even tone/texture that they provide. Also, what do you think about PHAs?
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