I'm a big fan of a small app called UpNote. It's clean and simple with a few power features you can use if you really dig into it. It largely has the same baseline set of features as Obsidian, but it supports syncing across devices out of the box and has a one-time purchase of a lifetime membership.

That's honestly the biggest potential upside with Meta's Threads in my opinion: better chance to grab more of the big online personalities (e.g. it's on the record that they've been reaching out to major celebrities) and (at least for the foreseeable future) Meta seems invested in full-featured Fediverse interoperability including account migration, etc.