Greenhouse isn't ready to be compared to Atlas just yet, the development has only been ongoing for a matter of weeks. That being said, Atlas costs money, and Greenhouse is completely open source:
If you're more comfortable with Obj-C/J, then Cappuccino is the way you should go. Personally I use SproutCore because I'm far more comfortable in JS/HTML/CSS.
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[ 3.2 ms ] story [ 30.8 ms ] threadAtlas: Costs Money.
http://github.com/sproutit/sproutcore/tree/mg/master
If you're more comfortable with Obj-C/J, then Cappuccino is the way you should go. Personally I use SproutCore because I'm far more comfortable in JS/HTML/CSS.