Eyes is really unimportant these days as there are plenty of countries not on that list which will be happy to spy.
The main thing about Tutanota you have to remember is the lack of interoperability with anyone not on that service, and the fact you cannot use an email client (no bridge).
Skiff can recieve PGP emails, but unless everyone is on Skiff you’re not going to be really sending encrypted email once it lands it leaves the Skiff server.