I like Tutanota much more (except for the last week) for a few reasons. The ones that come to mind include email search, more affordable pricing, and more flexible domain allowances. Also, they tend to roll out new features on a faster timeline, such as the recent addition of a new domain verification method that few providers currently support (that I forgot the name of?) and an in-app calendar.

I use and like both. I don't do anything fancy with my email, though, so YMMV. For my use case they are equal.