Apple is a good choice if someone doesn’t know which company to start with. A lot of Apple customers have iCloud+ but don’t realize email hosting on your own domain is included in the plan. If you’re already paying for it you might as well use it.

I was totally unaware of this. I haven't quite been ready to pull the trigger on something like FastMail or ProtonMail, but I have a few domains kicking around and figure it's worth a shot to try it out. Thanks!