Mess with multiples Emacs distros (Homebrew)?
If you don't want to use Homebrew, you don't have to. This is really a matter of taste. You can use Homebrew or not. You can build the application from source or you can download from GNU here or Emacs For Mac OS X here - both yield the latest versions.

If you want to use Homebrew, I recommend that you use:

brew install emacs


then link the binary if you want to run from terminal, this can be performed via:

ln -s /usr/local/Cellar/emacs/26.2/Emacs.app /Applications


If you don't want to use Homebrew, use one of the binaries listed above. Keep in mind you can always link them later if you want to run the latest version from the command line.