I would say:

- No account needed for anything.

- Usability (feels more lightweight yet familiar to posting on social media).

- Share anything from other apps (Safari, Google Maps, Twitter, Reddit...) and have it rendered in app. I use this a lot to save things like places I want to eat, music (share from Shazam), movies (share from letterboxd), etc.

- YouTube video links are rendered (and playable from Journelly).

- Simplicity of where your data is stored (single plain text file). Easily accessible and friendly to data preservation.