Between those two, proper IMAP support (including IMAP push) is the big thing. Webmail generally drives me nuts for anything beyond stopgap usage, and while ProtonMail has a local IMAP adapter thing it’s a step too involved for me.
IMAP support is incidentally also why I don’t use Gmail. Their IMAP implementation is spotty and notoriously bad with Apple Mail, whereas the experience with FastMail is flawless.
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I’ve also been running custom domain on Fastmail.
Between those two, proper IMAP support (including IMAP push) is the big thing. Webmail generally drives me nuts for anything beyond stopgap usage, and while ProtonMail has a local IMAP adapter thing it’s a step too involved for me.
IMAP support is incidentally also why I don’t use Gmail. Their IMAP implementation is spotty and notoriously bad with Apple Mail, whereas the experience with FastMail is flawless.