Protonmail is too much for me. First, the price is a bit exaggerated. If we take Fastmail as an example, is cheaper and, in my opinion, is more mature and more well-integrated. The masked emails feature is very nice and you can reply using the masked emails too. Recently, Protonmail acquired SimpleLogin, but let's see what comes out of this acquisition.
Personally, I would use Outllook with SimpleLogin and the experience would be as good as if not better than Protonmail. Privacy-wise, I see no point in using Protonmail and Tutanota when you send emails to other users who are using Gmail for example, right?