I do! Obsidian is a little more polished and stable and has Zettel plugins that you can add that makes it feature equal to Zettlr imo.

1Writer has totally worked for me. It isn't a clone of Obsidian, but it is good enough for me to work on notes, do my daily journaling, and link things together. Also, the fact that you can have multiple windows stacked on iPad helps.

You can do it by using 1Writer and storing the Obsidian vault on iCloud.

I think it works with Dropbox too but you’d have to use something other than 1writer but not sure what