[ahmaman]

A word of advice, always use a custom domain, alot easier to change providers.

As for switching, I did it few times.

From microsoft to migadu. Switched to custom domain at the same time. Migadu was good for the price but in the early days it wasnt very stable and I wanted something more private.

From migadu to Tutanota. More private but tutanota wasnt as polished and can only be used with their custom email clients. Again great value for the money but I was missing better UX.

Finally from Tutanota to Protonmail. It was painful to export emails from Tutanota. I am very happy with Proton. If money isnt a constraint I think it is the best option for privacy focused providers.