As you know I use the Airmail App to handle all my Mac, iOS and iPadOS Email chores. It does cost money, but it is a great App. However, the iOS and iPadOS versions of the Apple Mail App is a pretty decent App. It has been improved over the years. I think if I was not using Airmail, I would probably use the iOS and iPadOS versions of the Mail App. The Mac Mail App is just too buggy for me. If you are an iOS and iPadOS Mail App user, then you would be benefitted by reading this very thorough article on managing Email in those Apps.