Ranked in these QuestionsQuestion Ranking
Pro CoffeeScript and SCSS support
Pro Allows collaborating on code
JSFiddle makes it easy to save the code snippets and send the link to others who can view and edit the code.
Pro Supports a wide variety of frameworks and extensions
JSFiddle can switch to selection of frameworks and extensions including jQuery, AngularJS, ReactiveJS, D3 simply from a dropdown.
Pro Very addictive
Users gain XP for every challenge they complete, can unlock achievements and climb the global leaderboard. This provides the user with a genuine sense of progression as their skillset increases.
Pro Learn to think like a programmer
Almost everything relating to learning to code is geared toward only teaching basic syntax. Edabit goes beyond syntax and teaches its users how to think like real programmers (problem solving) in a fun and interactive way.
Pro Get instant feedback
Users can start coding immediately while getting instant feedback. If their code works, they pass the challenge. If it doesn't, they fail and must try again.
Con Not actually an IDE
JSFiddle is not actually an IDE and is only suitable for small blocks of code.