The verdict
If you sell your own ebooks, templates, courses or merchandise and want to start selling this week, pick Sellfy. Checkout, secure file delivery and subscriptions are already there.
If you run a company that needs a well-designed marketing site you can change yourself, pick Framer. The CMS and hosting are included, and a designer or marketer can publish the same day.
If you are a creator who also wants a brand-led website, you do not have to choose one. Sellfy lets you embed buy buttons on any page, so a Framer site could carry them. Test that on a free Framer site before you commit to it.
I'd not use Framer to run a store, and I'd not use Sellfy as a company website. Each is weak where the other is strong.