When comparing Smooth CoffeeScript vs exercism.org, the Slant community recommends exercism.org for most people. In the question“What are the best resources to learn CoffeeScript?” exercism.org is ranked 1st while Smooth CoffeeScript is ranked 6th. The most important reason people chose exercism.org is:
Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro It's interactive
Many code examples can be edited right within the page changing the output in real time.
Pro Free
Available online for free.

Pro Human review and feedback
Rather than merely test for code correctness, Exercism uses peer review to improve general programming techniques. Users are encouraged to comment on others' solutions, and refine their own based on feedback.

Pro Practice with production tools
Unlike many code practice websites, Exercism requires the user to develop and test entirely offline, submitting only the finished code. This promotes familiarity with essential tools and workflow, not just the bare language.
Cons
Con Difficult to navigate
The Table Of Contents is located at the top only, there is no way to navigate from your current position in the tutorial.
Everything is lumped into the one web page with a limited number of titles/breaks, so it's easy to lose your spot.

Con Custom commandline client
Exercism requires using a CLI utility to fetch and submit exercises. This is inconvenient compared to web-only alternatives, and poses an additional barrier to entry for some users.
