For migrating content from Obsidian, you can use Dendron's markdown import pod (pods are ways that Dendron imports/exports notes):
Markdown import: https://wiki.dendron.so/notes/f23a6290-2dec-45dc-b616-c218ee...
Obsidian style import: https://wiki.dendron.so/notes/9kovmyM4T0ZBeWvp5oH62/
I still use Obsidian on mobile to view my Dendron notes, but use VS Code with the Dendron extension when on my computer :)
Also LogSeq: "It seems that your browser doesn't support the new native filesystem API, please use any Chromium 86+ based browser like Chrome, Vivaldi, Edge, etc. Notice that the API doesn't support mobile browsers at the moment."
... "Privacy first", and forcing you to use Google infrastructure.
I would steer clear of that one, hard.