Moved to Ghost, finally.
This is something I'd procrastinated on for a long time, and luckily, got a few hours on successive weekends, and made it happen.
Why Ghost? Cleaner writing interface, markdown-native, less cruft than WordPress had accumulated over the years (I don't miss that clutter at all). Also, the export/import process was ... pretty straightforward.
I picked MagicPages for Ghost hosting (one less thing to manage myself). Jannis, who runs that outfit solo, was very helpful and assisted with some migration issues I faced.
Have to spot check some posts and check some redirects but generally it looks good.
We'll see how Ghost feels after a few months of actual use ... the writing experience is noticeably better already — just markdown in a clean editor, no fighting with block editors or visual formatting nonsense.
That alone might justify the switch.
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(Note: if you're thinking about Ghost at all, consider MagicPages)