Remarketing ads almost always perform better because you are showing ads to users who seen you before! Think of it this way. Is it easier to sell to a warm audience or a totally cold one? Most users do not take action on the first visit to your website, they may do it after 3 or 4 visits. It is important to have remarketing tag installed properly on your website so that you can continue targeting these users after they left your website to bring them back to buy.