Over nextcloud probably the e2ee. I suppose soon they will also integrate this better with email (like you can attach directly and save directly from email), so the seamless integrations with the rest of the products will probably amount to other benefits over time.
What would be the benefits of this over Nextcloud, apart from not having to set it up?
Lack of true open cooperation? Oh wait, you said benefit… Ease of use? Maybe? And slightly less buggy?
Over nextcloud probably the e2ee. I suppose soon they will also integrate this better with email (like you can attach directly and save directly from email), so the seamless integrations with the rest of the products will probably amount to other benefits over time.