Salicylic Acid vs Alpha Hydroxy Acid vs Benzoyl Peroxide for Acne?

Okay so I have been using a 3 step treatment for my acne that includes a Benzoyl Peroxide cleanser, a Salicylic oil-free moisturizer and a Salicylic acid spot treatment, my acne still appears sometimes even after 6 months of using this. I'm starting to doubt the effectiveness of this treatment. After looking at Acne.org, the main founder of the site recommended AHA or Alpha Hydroxy Acid over Salicylic acid. My Question is which one of these treatments work the best on moderate acne? - Thanks.