When comparing Eclipse with PyDev vs Spyder, the Slant community recommends Spyder for most people. In the question“What are the best Python IDEs or editors?” Spyder is ranked 8th while Eclipse with PyDev is ranked 19th. The most important reason people chose Spyder is:
Spyder's autocomplete features are made possible by a library called [rope](https://github.com/python-rope/rope) which gives Spyder powerful autocompletion.
Ranked in these QuestionsQuestion Ranking
Pro Feature rich including Django integration
Django Integration, Auto code completion, Multi language support, Integrated Python Debugging, code analysis, code templates ,smart indent, bracket matching, error markup, source control integration, code folding, UML Editing and viewing, and unit test integration.
Pro Can be extended to have additional features through plugins
Eclipse has a large and active community, which has resulted in a wide variety of plugins.
Pro Good font rendering
Because Eclipse is based on SWT, it uses the native font rendering and thus looks better than other IDEs on some Linux systems, where the Java font rendering is not optimal.
Pro One of the few that can debug Jython code
It handles both Jython and CPython.
Pro Powerful autocompletion
Spyder's autocomplete features are made possible by a library called rope which gives Spyder powerful autocompletion.
Pro Free and open-source
Released under the MIT license.
Pro Graph plotting support
Spyder can plot graphs and provide the list of all variables.
Pro Has cross platform support - Linux, Mac, and even Windows
Spyder (formerly Pydee) has support for all of the major operating platforms - Linux, Mac, and even Windows.
Pro Relatively lightweight
Pro Helps you to use documentation
Pro Enables to write consistent code
Pylint integration enables to check the code for PEP8 style guide and detect errors.
Pro Has support for Vim bindings via plugin support
Aside from being an open sourced, actively developed IDE, vim key-binding support is also available. If you remember Pydee - this is it, albeit with a new name.
Pro Good GitHub project
Pro Excellent variable explorer
Dynamic variable explorer with editor and visualizer
Pro Completely Python
Con Plugins can be unstable
Though there are plenty of plugins to choose from, they aren't always reliable. Some aren't maintained, bug fixes can be slow, and you may need to download plugins from multiple sources.
Con The documentation is poor when it comes to debugging
Not a lot of information about debugging is available in the documentation.
Con Not beautiful
The default theme is not beautiful. And there are not many themes.