Bp kills the bacteria by oxidation while SA unclogs the pore and removes the upper dead cell.

so one attacks the active acne while other is apt for prevention.

i'd say use BP (1-2%, 3.5%) for spot treatment but use a SA wash regularly.(mild & pH balanced).

i been using a cleanser and a moisturizer for 2 weeks and my skin got better ^.^

BP cleanser

Salicylic Acid Moisturiser