I use proton, but that's mostly because they let me connect my custom domain and also bundled a vpn service with the email. I pay a little less than $100/year for their pro plan (they bill me like $190 every two years) and I think it's worth it, but also I use it for both personal and professional stuff so it's probably not something most people would need
They also have free products, but I haven't used the free versions so I can't vouch for how good they are