When comparing Python Programming Fundamentals vs CheckiO, the Slant community recommends CheckiO for most people. In the question“What are the best resources to learn Python?” CheckiO is ranked 18th while Python Programming Fundamentals is ranked 30th. The most important reason people chose CheckiO is:
Users can publish their solutions for different problems and other users can review the code and give their opinions on how they would have solved the problem. Sometimes, some of the most active users get their code reviewed by Guido Van Rossum (the creator of the Python language) himself.
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Pros
Pro Practical
Fun project to build as you learn.
Pro Beginner-friendly
Excellent for complete beginners with no previous experience.

Pro Community backed solution reviews
Users can publish their solutions for different problems and other users can review the code and give their opinions on how they would have solved the problem.
Sometimes, some of the most active users get their code reviewed by Guido Van Rossum (the creator of the Python language) himself.
Pro Available in multiple languages
CheckiO crowdsources translations for problems. Currently problems have been translated in 10 languages. So it's highly possible that eventually more languages will be supported.

Pro Ability to create new challenges
New missions can be created and uploaded using GitHub. After that is done, it's suggested to CheckiO and if it fills all the requirements after being reviewed by a CheckiO team member, it's pulled into the game.

Pro Challenges from GitHub, O'Reilly, Dropbox and Hubspot.
Cons
Con Uses commercial software to teach the language
One of the first things the guide asks you to do is create an account with Nitrous.io to use their cloud IDE. While Nitrous has a free plan, the practice of doing that is questionable.
Con Not for absolute beginners
CheckiO does not teach syntax, instead it teaches how to solve problems using a particular programming language therefore some basic programming knowledge is required to start.
