It depends. If I were to write an app that I was sure was only for macs, I'd write Cocoa only. I find it a joy to develop for. If platform independence is impo

It depends. If I were to write an app that I was sure was only for macs, I'd write Cocoa only. I find it a joy to develop for. If platform independence is important, I'd still choose Cocoa but try to wrap the main functionality in platform-agnostic C/C++ or the like.