Oh its a Million Dollar question.. haha.. Well there are many products claiming to be the best with some good testimonials ( some real and many fake ) But the real thing is " Scar can't be completely Removed". Some scar removal creams containing silicone, onion extract, vitamin E may reduce the appearance of the scar making it less visible but results may vary from person to person.
According to Drugstore.com here are top five scar removal products:
Mederma Skin Care for Scars-------------------------$26.99 for 1.76 oz (50 g)
Neosporin Scar Solution silicone scar sheets ----------$29.99 for 28 sheets
Scarguard Scarcare----------------------------------$59.99 for 1 fl oz (30 mL)
Curad Scar Therapy----------------------------------$15.79 for 21 pads
Vita-K Solution for Scars and Bruises------------------$10.31 for 2 oz (56 g)