Ranked in these QuestionsQuestion Ranking
Pro Sync with other Apple devices via iCloud, other cloud/email services
It syncs with iCloud, and surprisingly, also with Gmail and possibly other services too.
Pro Rich-text editing
Allows for simple text formatting and making TODO lists with checkboxes.
It's a default system app, making it easy to find and use since it is already installed.
You can add files to notes and then filter notes by attachment types.
Pro Supports sharing
Pro It's fast, and syncing is very dependable
The app launches quickly on both Mac and iOS, it also syncs quickly (in seconds) and very dependably across different Apple devices.
Pro It remains simple to use with a gentle learning curve
Despite the significant new updates in iOS 9 and iOS 10, you can start using Notes immediately, then try/master new features with ease — definitely a gentle learning curve.
Con Cannot export to a format that can be imported again
This makes it impossible to backup your notes as files that could be managed by your backup system, you can only use things like iCloud and Google or export to PDF which would not be able to be re-imported in the case of storage failure.