It depends on how badly Microsoft continues to fuck up Outlook (classic).

I don't use Outlook for my personal email, but I've used it in various corporate engagements and not been wholly dissatisfied. Newer versions are slower, more bloated, and unstable (though add-ins-- especially the Teams add-in-- contribute to that).

The most egregious regression, for me, has been the "Advanced Find" functionality (which was wonderful in the 97 thru 2010 versions) being changed-out for the god-awful search box within the Outlook window.