The verdict
If you are a creator who just wants to sell files or subscriptions to an existing audience, I'd pick Sellfy. It is the shorter route to a first sale. If you are a small business that needs a proper site with pages, a blog, bookings and a shop, I'd pick Wix. Wix also has a free plan, so you can try the editor before spending anything, which Sellfy does not offer. Read the Wix plan comparison against the features you need, because payments and ecommerce depth depend on the plan. Sellfy plans depend on annual sales volume instead.