If the site's main job is selling, Shopify is the answer. It handles the whole business of a store, products, payments, shipping, tax, inventory and a huge marketplace of apps, far more thoroughly than the ecommerce add-ons bolted onto general builders. It scales from a first sale to a serious operation without a replatform.
For a simple brochure site it is overkill and overpriced, and the monthly fee plus transaction costs add up. But for a real online store, the other builders are compromises and Shopify is the tool built for the job.