Again, depending on your needs perhaps Logseq is fine. It seems that developers of each app (Logseq and Obsidian namely) have this expectation of how users want to use their apps but in my experience they are both configurable to use Tags, Folders or Links to organise content. This lets you take notes and organise in several ways.
Logseq is FOSS, Obsidian is not and is more popular (thus larger community plugins/themes ecosystem). That's the main difference.
I would love for someone to walk me around what SN can do and walk someone around what Obsidian can do.