2 Answers
New AnswerI've tried both, using python. Codewars is really well organised, good challenges, precise whecking of your codes, interesting community members solutions you can check after you found a working one. It's a good tool to step up from SL. CodinGame is trying to be attractive with the fake ingame context, (humans are attracted by moving images, that's a fact) which actually makes it heavy and much less handy.
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