When comparing Terminal.app vs Emmet, the Slant community recommends Emmet for most people. In the question“What are the best plugins for Sublime Text?” Emmet is ranked 3rd while Terminal.app is ranked 28th. The most important reason people chose Emmet is:
Emmet does not only work with HTML, but also CSS.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Default terminal on Mac
Since it is already installed by default, you don't need to worry about finding and installing another terminal.
Pro Light on System Resources
Terminal.app lighter uses less system resources than iTerm having the same number of windows, tabs and processes going on.
Pro Great compatibility
Works with everything.
Pro Easily open man pages
By right clicking on a highlighted string you can easily search through the man pages for that string and the man page will open in a nice pop up window.
Pro Excellent xterm emulation support
Pro Beautiful
Terminal has nice colors and font options.
Pro Makes writing CSS really fast
Emmet does not only work with HTML, but also CSS.
Pro Makes writing HTML really fast
Either watch the video below or read this article to see all the things you can do with Emmet. the video link is absent
Cons
Con Updates are released rarely
Terminal usually gets an update when any new MacOS version is released, which is every couple of years.
Con Tab names are volatile
The tab names never stick -- it's imperative that this should work.
Con Background images are stretched rather than clipped
Con Occasionally crashes
Working remotely with a full buffer may cause complete terminal app crash.
Con Home and End keys require shift being pressed
Con Requires pyv8
Emmet is a Javascript addon, and it requires pyv8 (python-javascript bridge) to run.