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Dendron does not pull notes off your system unless you want to explicitly. There are easy guides for syncing with Github or you can always use Dropbox, Onedrive etc. to sync your notes wherever you want.
Pro Built into VSCode
If you're already developing in VSCode, it's great to have your notes in a familiar environment. Reduces switching costs and you can use familiar keybindings.
Pro Powerful built-in publishing
Dendron ships with a configuration for publishing your notes with 11ty. The resulting site is searchable and easy to navigate, and the VS Code extension can easily place links to notes in your clipboard for rapid sharing.
Pro Flexible hierarchies
Dendron makes it easy to create and refactor hierarchies at will.
Con Built into VSCode
If you're not familiar with VSCode, there may be a steep learning curve.