Recs.
Updated
SpecsUpdate
Pros
Pro Infinitely customisable
Customizations can be made to a wide range of Emacs' functions through a Lisp dialect. A robust list of existing Lisp extensions include the practical (git integration, syntax highlighting, etc) to the utilitarian (calculators, calendars) to the sublime (chess, Eliza).
Pro Self documenting
Emacs has extensive help support built-in as well as a tutorial accessed with C-h t.
Cons
Con Non-standard keyboard commands
I'm editing this in Chrome, but I could be using Firefox, Edge, or any other browser, or Notepad, or even Libreoffice or Microsoft Word, and in ALL of those cases, keys would work exactly the same way, including how to jump around by word, select words, cut/copy/paste, etc.
Pretty much all modern editors share the same basic key combinations, from Visual Studio to Sublime to Atom to VS Code to Xcode. Becoming an Emacs expert means you need to mode-shift between code editing and editing in your browser; adding Emacs modes to SOME apps means you need to remember which key bindings to use where. The cognitive load added by switching between Emacs and other text editors is not worth it, especially since all the advantages of Emacs are now available in free editors elsewhere.
Con Not set up as an IDE by default
Requires customization to get IDE-like features. Luckily a few features such as compilation, debugging, and syntax highlighting are included.
Con A UI designed before anyone had a clue about UI design
Emacs is positively NOT a well-designed user interface. Its design dates back to the time when all microwaves still needed instructions and VCRs universally displayed a flashing 12:00 because no one could figure out how to operate them. Many modern editors have 100% of the power of Emacs with none of the hassle.