What can fade acne scars faster a sulfur based product or lemon juice?

i got both of 'em at home and i don't know which one can work faster and better for me,i just had the worst breakout of my teenage life i've got like 7 scars which aren't severe but yet embarrassing,and my girlfriend is coming back from a trip in four weeks,so which one of them can make my scars go away by that time.please help!