Protonmail probably the most hyped, but personally I switched to Tutanota. I like their commitment to open source - you can build their webmail client yourself.

Protonmail probably the most hyped, but personally I switched to Tutanota. I like their commitment to open source - you can build their webmail client yourself. They support full text search (unlike Protonmail) and also 4-5x cheaper than Protonmail/Fastmail, if you're fine with their cheapest 1GB storage plan.