I’ve been using Mitsuharu’s port for years, always compiling it myself from his bitbucket repo. I am no longer sure how different it is from the vanilla GNU distribution. When I first started using emacs, long before the Mac port, the current version was 18.57, I think. It was a long wait for version 19 to appear, being the first version with proper X11 support. It amazes me to think of how much has happened since, and that emacs is as useful and relevant now as then.