It's not ALWAYS about price. It's about how well does the home show, does the potential buyer understand the benefits of your features, and are there favorable terms? Professional and specialized representation is key, but also what is the buyer's situation? Having Closing Costs paid is attractive to many buyers that may need the cash to get into a home. Some may be attracted to a lower price, but if you want to do one or the other, and you were in a price range where folks are short on cash, I'd offer the closing costs.
It also depends on your competition. In some areas, a little bit will make the difference.