Obsidian is great; all the files are readable anywhere (easy to migrate out if needed) in a clear, readable directory structure, copying the structure you see in Obsidian itself.
For something like $8/m, you can have their official sync tooling and have it on any devices at the same time, but there are also free options for synchronisation, which require a little work.
You can probably find tools that would migrate your content from Anvil to Obsidian, but also the other way around. There are generally plugins for almost everything; however, there are too many plugins you can use; it’s easy to get lost there. Also, as with many other plugin marketplaces, there is no security vetting on the plugins, so you need to be careful.
Obsidian is great; all the files are readable anywhere (easy to migrate out if needed) in a clear, readable directory structure, copying the structure you see in Obsidian itself. For something like $8/m, you can have their official sync tooling and have it on any devices at the same time, but there are also free options for synchronisation, which require a little work. You can probably find tools that would migrate your content from Anvil to Obsidian, but also the other way around. There are generally plugins for almost everything; however, there are too many plugins you can use; it’s easy to get lost there. Also, as with many other plugin marketplaces, there is no security vetting on the plugins, so you need to be careful.