Honestly, they're very similar. Medium feels much more polished. Svbtle has the cool kudos, color picker and brain-dump-title-post-draft maker thing going on. But that's it. Both have the idea of collections or magazines. I feel like Svbtle did wait waaaay to long to open this up. They don't offer anything starkly different from Medium. They should have been monetizing a while ago. Why the wait?