Best Framework for RPG/RTS Platform Dev?

Just starting off on iPhone development and I开发者_JAVA技巧'm looking for some input as to the best platform/framework upon which to build at the moment. I've looked at various options a year or so ago such as cocos2d, unity, and others, however I'm looking for some more current input from those in the trenches.

I am starting on an RTS Diablo-esque game and would like to understand what the highest recommendations at the moment may be with the most robust APIs, etc. for iPhone/iPad development. In addition, as a plus but not required, it would be nice to understand how portable the platform would be to the desktop. Bonus++: portable to other mobile devices?

Thanks in advance for any input!

nowadays we have cocos3D still beta, but maybe worth check it out. http://maniacdev.com/2011/02/open-source-cocos3d-take-cocos2d-apps-to-another-dimension/

Cocos2D because you can incorporate Tiled map editor into your game making RPG/RTS design (relatively) easy. But, that's just my opinion you can do it however you want technically. And just going to the site now it seems they have released a version of Cocos2d that will work on the Mac too.