I use Obsidian for a very simple use case compared to everything it can do. Synced markdown across all platforms, simple lists in named files, share those files to other software to perform actions against those lists.

For this use case it is the absolute best of the bunch. I've used a lot of these sorts of complex second brain things and I've settled on a very minimal approach wherein Obsidian was the clear 'best in show' for what I needed.