One of these is built around writing and the other around designing, which sounds like a clean split until you notice they cost almost the same and both have a free plan. The differences that matter are further in.
Writing against designing
WordPress.com is the managed version of the software a great many websites already run on. Content exports in a file another WordPress site will read, plugins are available from the cheapest paid plan, and a free domain comes with paid plans. If the site is mostly words that accumulate, this is the one built for that.
Framer scores 5 for design against WordPress.com's 3, is made to feel like a design tool, and configures motion and interaction without code. A custom domain is included on the entry paid plan. If the site is a handful of pages that need to look right, it gets there faster and better.
Framer has no store, no appointments and no marketing email, and no export at all. WordPress.com exports.
What happens at month thirteen
WordPress.com's advertised entry rate lasts twelve months and then renews at roughly two and a half times as much. That is why Framer scores 4 for value against WordPress.com's 2 despite Framer's paid tiers being higher on the page — the comparison people make at signup is not the comparison they live with.
Framer's counterpart caution is the free plan, which the vendor describes as non-commercial. It is a real place to build rather than a trial, and it is not a place to run a business from.
WordPress.com scores 4 for room to grow against Framer's 3, and the reason is scope rather than polish: plugins, an archive, a very large ecosystem. Framer scores 3 for ease and WordPress.com scores 3 as well, so neither is the simple one here.
Which should you choose?
Choose WordPress.com if the site is going to accumulate — posts, pages, an archive somebody searches — and you want it portable to real WordPress hosting later.
Choose Framer if the site is small and the look is doing the work, and check the non-commercial wording on the free plan before you build a business page on it.

WordPress.com
The managed version of the software a great many websites already run on.
Framer
Made to feel like a design tool, with a short path to a live page.
Specs
Ratings
Ease for a beginner
Design and templates
Room to grow
Help when you are stuck
Value for money
Features
Pricing
WordPress.com
Framer
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