GUItexture or New UI tools in Unity 4.6

What to use for mobile game? I can create pause menu in two ways:

First. With GUItextures.

 PauseMenu  (blank gameObject)
 - Background Texture (GuiTexture)
 - Close Button (GuiTexture)
 - Window text (GuiText)

Second. With New UI tools.

What performance differences between them?
Or is it the same thing?

Of course new ui.