Channels versus folders make it much easier to organization information and to access it.
Because of the channels, you get a better idea of what your team's up to: bolded channels mean your team members made changes in those.
Permissions are handled at the channel level so that you never wonder if some team members have access to a specific note.
A quick search (⌘ + K) will let you find through all your content thanks to a simple keyword or even check out what your team members are up to with their usernames.
Thanks to a light and clean editor, your team can focus on writing and not formatting. It also makes much easier to structure across your team.