[Product Request]Which Aha/bha should I use?

Hi everyone! I’m looking to add either a hyaluronic or lactic acid to my routine and I’m just wondering which would be best? I have dry, flaky skin and moisturisers don’t add enough moisture if that makes sense? I’ve done research into both products but I’ve seen mixed opinions on both so I’m just wondering if anyone has any tips! I’m looking to add more hydration to my skin and stop the flaking. My current routine is Cerave cleanser and moisturising cream, so i‘d add the acid in the middle of these. I don’t have acne but i do have eczema, however it only ever flares up in two specific spots on my face so I think If I avoid putting product on these spots it’ll be fine. If anyone has any advice on this it would be really helpful thanks!!