Neither. The single app that Proton has done somewhat right with is their VPN and only because they haven't eliminated port forwarding. Everything else they've utilized non-standard protocols and failed to provide source code or API docs. They basically said that users are too stupid to protect themselves, and that you should just trust them to do it for you.

They failed to provide CalDav & CardDav syncing for things like calendars & contacts, IMAPS for mail, and prioritized things like their cloud-only password store. They had no valid reason not to use standardized protocols other than to prevent their users from actively syncing local copies of their data to integrate with privacy-friendly open source software. They act like Apple & a lot of their users prob. are Apple fan bois who will trust a company no questions asked. I have no reason to trust them whatsoever.

It depends on what you want. If you want a solution that makes sure your provider won't be able to read your data? It is sure safe for that.

Generally I would distrust any company claiming that our swiss privacy laws are worth a dime - in fact they are shit and among the worst in Europe. Swiss intelligence laws actually force companies to cooperate in a much broader sense than even the national security laws in the US do. And of course there is no judge involved and they can basically share the collected data with whoever they want.

It's pretty great. Especially considering that you get a full ecosystem with Mail, Calendar, Drive, VPN and Pass.

I would also like to take this opportunity to shout out murena.io. They host open source cloud solutions. You get a Nextcloud with OnlyOffice and lots of other goodies and their pricing is pretty good