Well I mean I also have a dilema Tuta or Proton,... hm....
Not really about E2EE because for most usecases this is not the feature that average user should look on, since mainstream is not using it anyway (unless you have someone who is using same email provider or PGP to take full advantage of it), in the end, if you are sending something sensitive you can always use pass protected mail which is a great feature if we take into account that other side will have almost always unencrypted mails at rest.
Encrypted subject,... hm could be useful for some, not needed for others, depends.
Proton has more sweets and ecosystem (someone here wrote that those sweets are almost always on half-way done) and is also more pricy compare to Tuta, but Tuta right now is more like simple mail with calendar, which is not bad really if you don't need any extra sweets or whole ecosystem.
Well this is really hard.
Also one thing that I got in mind that most users are not thinging about is that where you are also located, because I guess if you are not from EU country maybe a Proton is generally better for if you need to resolve stuff with the company, bot for EU users Tuta is bind more by global EU laws idk.
I am also not sure if Proton has better aliases handling.
If we not count an extra sweets and ecosystem. Which of those two would you go for based on pure features of an email (also take into account that they both provide option to have aliases and extra emails)?
Also a question about aproach of multiple emails, is it overkill to use separate account for different activities (litterally two different accounts)
or just one account and using of aliases + standalone extra emails for more persistent things?