Ironpython
IronPython is an open-source implementation of the Python programming language which is tightly integrated with the .NET Framework
Ironruby
IronRuby is an open-source implementation of the Ruby programming language which is tightly integrated with the .NET Framework.
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Ironpython has had more time to focus on performance improvements but ironruby has made significant performance improvements as of late from question Performance comparison between IronRuby and IronPython |
Since developing in ironruby ironpython is faster you can use developing in ironruby ironpython to write pocs and later implement the real application in c# or whatever you re using from question Making the Case for IronRuby and IronPython |
However as things stand right now ironpython is much more mature and has much better performance than ironruby so you may prefer to use that from question Extending C# .NET application - build a custom scripting language or not? |
Also i believe the ironruby team is smaller than the ironpython team from question Why doesn't IronRuby have the same tools that IronPython does? |