When comparing Gnome Builder 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 Gnome Builder is ranked 17th. 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 Great language support (for linux based projects)
Python, C, Java, Javascript, Go, Vala, C++, and many more.

Pro Integrates nicely into the GNOME Desktop Environment
Client-side decorations, good use of widgets.

Pro Lovely find and replace tool with great REGEX support
Shows a live feedback of what matches the pattern/criteria entered.

Pro Terminal built in
Fully featured terminal is packaged.

Pro Autocomplete
Fast autocomplete.

Pro Supports versioning (git)
Shows diff indication and has branch integration too.
Pro Integrated debugging

Pro Integrated system-wide profiler for improving software performance

Pro Templating
Good templates available to build applications, even to build gnome applications.

Pro Tiling Editor capability
Supports Tiling.
Pro Extendable through plugins
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 No project management
Because it is still in early development there are little project management functionalities.
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
