Another great thing about Wix, the quality, variety and flexibility of their themes. This is true both of the normal sites and online stores as you can see from this gallery. They now boast over 500 different design templates to choose from including 100+ templates specifically designed to building an online store.
Wix have a solid selection of apps both in-house and third party developed apps. There is much less choice than with Shopify and BigCommerce but there is something to be said for not being overburdened with too much choice.