Shopify and WordPress (with WooCommerce) can both run a great online shop. The difference is how much of the running you want to do yourself.
Shopify is all-in-one: hosting, security, payments, and updates are handled for a monthly fee. It's the quickest route to a reliable store, and the best fit if selling products is the heart of your business.
WordPress gives you more control and suits businesses where content and SEO lead and the shop plays a supporting role. It needs more looking after. If you're unsure, start with how you'll sell in two years' time, and choose the platform that gets you there.
