I use posteo and it works very well for me.The german computermagazine ct' listed them as very good when it comes to privacy and secruity. Link to one article (german): https://www.heise.de/newsticker/meldung/So-funktioniert-E-Mail-made-in-Germany-2188248.html
I don't know the others so it's I'm probably not being very helpful here. If you have questions regarding posteo i could try to help you.
