They're the same in the sense that Mail.app and Outlook are the same.
Apple Notes is great, but can't do things like tagging/graph view and doesn't allow you to export in a standardized format.
Obsidian is a superset of Markdown (with a few modifications for page embedding and wiki-links) and allows you to sync with anything that provides a way for you to upload a folder of text files.
Apple Notes is great, but can't do things like tagging/graph view and doesn't allow you to export in a standardized format.
Obsidian is a superset of Markdown (with a few modifications for page embedding and wiki-links) and allows you to sync with anything that provides a way for you to upload a folder of text files.