Just wanted to add a bit about Proton since you mentioned it and I use it quite heavily.

Pros:

• All-in-one platform for storage, mail, VPN, password manager and calendar. Usually works out cheaper than multiple providers.
• E-mail aliases built-in to the password manager makes it a breeze to manage. (Tutanota also supports aliases.)
• Personally, I think the UI is more polished. Not important for privacy but it’s a plus for the non tech-savvy.

Cons:

• All-in-one platform. I’m acutely aware that I’m going to have a headache if Proton is enshittified.
• If you’re not looking for all of the products they offer, it’s just expensive. Tutanota is cheaper for e-mail alone.
• The Drive app needs improvement. Migrating my files was painful and I want automatic Camera uploads. You might be okay with the Windows desktop app.
• The Calendar app has issues when not connected to the internet.
• The password manager doesn’t have a desktop application and managing it through the browser extension or app isn’t great.
• No subject-line encryption support (and other PGP interoperability issues on the free version) but… unfortunately, I don’t get many PGP encrypted e-mails anyway.

Otherwise these two are largely like-for-like for e-mail. There’s no benefit to Proton being hosted in Switzerland and I didn’t move to be warrant-proof or anything silly. The idea is really just moving emails away from an advertising company and paying for a quality service.