I don't know if the native app on the Mac is the same as the Windows one, but the latter is absolute crap. It's sooo laggy. Sure, I don't have a 64 core thread ripper or other ridiculous CPU, but even on my 11th gen i7 work laptop, the webapp runs circles around the native app. Even on Firefox on Linux.
However, they must have caught wind of this, because there have been some "improvements" recently, where they reduced the vertical screen space with an empty menu line, and it also feels a bit less snappy than before.
Off-topic but I need to get this off my chest: Outlook on the web is a much better experience than the native app on the Mac.