When comparing Codechef vs exercism.org, the Slant community recommends exercism.org for most people. In the question“What are the best coding challenge sites?” exercism.org is ranked 1st while Codechef is ranked 18th. 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
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Pros
Pro Large number of languages supported
Codechef supports an impressive number of languages in it's platform. More than 35 languages are supported, all with several problems and challenges and contests.
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 Interaction inside the community is limited
The Codechef forums are not very active and they are the official way of interacting inside the Codechef community. Other than the forums, the only way of interacting with other members of the community is through the comment sections of different problems.
Con It's young age makes it not popular for recruiters
Codechef is still pretty young especially compared to it's competitors. So it's not very popular with recruiters yet.
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.