Syncthing is very good, but the best iOS implementation, Möbius Sync[1], is not comparable with the Android one (the OS limits the syncs, you need a regular notification and so on).
The great things about Logseq are his weakness for me. Everything is so interconnected (you can say: "here put the paragraph of this other note") that I sometimes lose confidence in the system. It becomes too complex. With Obsidian I know that a note is a file. Less convenient but simple and reliable.
Logseq really excels with his outlining mode, I miss it (but I don't like the way it saves states in the markdown file). It has some problems with the code blocks too.
[1] https://www.mobiussync.com/
