Earlier quoted context omitted.
If you have a "zero inbox" type approach, I find Mail.app to be serviceable, but to each their own. There are a few others to try. I used Airmail a few years ago. However, be on the lookout for "native" email clients that are really just web gmail wrappers.
I've been curious about Airmail, but I'm tiring of OSX, to the point that I'm leaning towards switching back to Linux.
I think I'll go back but I'm not sure.