[dragos2]

This is really a hard call. On one hand Java is easier to learn than Obj-C in my opinion, on the other hand XCode provides a better workflow than Eclipse, IntelliJ or the newly released Android Studio.

Some people suggested going with a multi-platform framework. I'm against that because you will not really learn how Android or iOS apps really work.

For me, a multi-platform framework is really good when you have limited resources and want to quickly build an app for more platforms. For learning purposes, I recommend going native.