Best technique to create the UI menus like in zombieville usa 2 on mobile platforms?

Hello, I am new to Unity and I am wondering what is the right or proper way to make a UI system like zombieville or battleheart. I roughly know that there are three ways to make UI in Unity.

1. The first is using the UnityGUI, which require lots of code inside OnGUI(). I am not afraid of the coding, but this way seems to have problems on mobile platform.

2. The second is using GUI Textures. This seems a better way. I am not very sure if I can acheive the same effects using this approach entirely. As far as I know, GUI Textures cannot be rotated....If I want to rotate a UI element, how can I do this using GUI texture....

3. The last is to create the UI elements in 3D apps like maya, and the UI elements are actually planes...I tried this way also, and it seems to work well, but I am not sure if I can make a quite complicated menu system in this way.

Thank you very much if you can help me and give me some suggestions.