If the acne is mild then the salicylic acid is the better option but if the acne breakout is severe then the benzoyl peroxide would work much better.
You can also get rid of your acne at home by using some cotton balls soaked in lemon juice and apply the lemon juice to the acne and then leaving the lemon juice on your acne for at least 10 minutes and then wash the lemon juice off with water.