For you? AHA because it’s better for dry skin. It’s water soluble and helps hydrate the skin. AHA works quite well for lightening dark spots too.
A low percentage BHA can work but you have to see if it will dry out your skin or not. I use these in my routine.
Cosrx One Step pad is presoaked so I would use it almost everyday, it can dry out my face if I am not careful. It’s the middle strength of BHA in the COSRX range.
Pixi Glow Tonic is a 5% glycolic acid, it does sting the first times I use it because glycolic acid is the most penetrative AHA but now it just feels nice. I ran out of Cosrx and intend to finish Pixi Glow Tonic. So far I feel my face is a bit more moisturized than using BHA.