When comparing KDevelop vs CLion, the Slant community recommends CLion for most people. In the question“What are the best IDEs for C++ on UNIX-like systems?” CLion is ranked 5th while KDevelop is ranked 10th. The most important reason people chose CLion is:
CLion has an intelligent autocompletion engine that tries to predict the symbol you are typing based on your previous history and the context in which it's being typed.
Specs
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Pros
Pro Excellent syntax highlighting
Kdevelop has very smart syntax and semantic syntax highlighting.
Pro Intelligent code completion
CLion has an intelligent autocompletion engine that tries to predict the symbol you are typing based on your previous history and the context in which it's being typed.
Pro Cross platform
Clion works on Windows, Linux and OSX.
Cons
Con Only preliminary support for Windows
Con Works with no problems only on Linux
KDevelop is an IDE for the KDE platform. Even though it's cross-platform, it's mostly targeted at Linux systems and the versions for other operating systems are highly experimental.
Con Proprietary
Clion is proprietary software which costs $199/1st year for a business license or $89/1st year for an individual license.
Con Build Tool Integration is messy/over complicated
I have a Jetbrains annual subscription so I can use this tool for free and I've used the Java IDE for years so I really want to like CLion. But it's just over complex to add 3rd party libraries etc. Netbeans/Eclipse etc are much better integrated with the build tools