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The official Sync is focused on providing a more integrated experience in the Obsidian app

- Built-in version history

- Cross-platform support, especially on mobile

- Fine-grained control (e.g. different theme/plugins/settings per device)

- Sharing your vaults with other users

Synology Drive is a file and folder syncing system.

Obsidian is a note and wiki syncing system.

You should use an obsidian syncing system if you want to sync notes and wikis. You should use a file syncing system if you want to sync files.

This reply does not address parents question at all.

A key feature of Obsidian is that it stores your notes in an open folder structure on your file system.

A very valid question is whether there are benefits to using a special note sync application rather than a standard file system sync application, and if so, what those benefits are.

I've been using Synology Drive to sync Obsidian between different machines and my android phone and it works great. I've never seen a need to use the official sync.