i tried some of the clients but neither satisfied me like gmail does.
The search, the functionality and also the swipe behavior of the native apple client is way worse then the gmail client. This also terminated the use of an icloud mail adress, so I forwarded this to my gmail.
I also do not want another account for my email client just to access my mails, so most of the other clients were out of the race. In the end I stick to my gmail account and it’s app, cause it satisfies me the most.