Corona is multiplatform mobile SDK that is based on Lua that has become rather popular. I wanted to start some healthy discussion on what the pros and cons are between the two.
Here's some of my observations/opinions
More mature and established SDK
Support for hardware Accelerometer, GPS, Compass, camera, etc.
Support for integration with Maps, Facebook, OpenFeint, and Game Center
Based on Lua which is fairly simple and easy to learn
Have had a number of good "flagship" apps which have been in the top ten lists.
Good Community Support
iOS and Android only (though for some this might not be an issue)
Lua is not an object oriented language (though you can do "quazi-obect oriented" stuff)
Subscription based model (have to keep purchasing each year)
Andriod support has been buggy (though a recent update has addressed this)
Support for more platforms (iOS, Android, Flash, HTML5, Windows, Mac & Linux)
Based on Blitz languages which have been stable and simple to learn
Object Oriented language
Purchase only once (and cheaper)
Good Community Support (many coming from the Blitz community)
Still in it's infancy, so less features and not fully stable yet.
No support for hardware GPS, Compass, camera, microphone, etc.
(I read somewhere that Monkey does support the accelerometer, but maybe that was with a plug-in)
Physics not built-in (though looks like it will be supported with third party modules)
No "flagship" apps which have been in the top ten lists (at least not yet)