I didn’t love the idea of the Proton basket for all my eggs. Besides I already self host alternatives to the whole g-suite, so I didn’t have the need for a drop in replacement. So I went with Fastmail. I am a huge fan of the alias and masked email options, and beyond those it works as expected for an email service. The mobile apps are decent, and I was able to get them on a de-googled android device. No complaints.