RubyMotion is a huge win for me because of the super low friction toolchain. I don't ever have to load XCode and I can automate the build process however I like because it's all command-line based.

I was convinced the moment I checked out https://github.com/HipByte/RubyMotionSamples and just started typing 'rake' in each directory not ever having to setup directory paths for xcode project settings.