The Raspberry Pi Foundation make it pretty clear that Raspbian is the recommended operating system for the Raspberry Pi series of computers. Most of the Foundation's documentation and support directs users to Raspbian. The downloads section of their website does list other operating system images. But there are many more images available, and one really piqued my curiosity; a Ubuntu 14.10 / Linaro 15.01 "developer" image. Unlike Raspbian, this image is compiled for ARMv7/armhf.
But this "developer" image has no official support. It is not supported by Linaro. Nor is it supported by the Raspberry Pi Foundation; it's not even mentioned in the Downloads section of their website. You see, the "developer" image is created by Toby Wintermute, a software developer who lives in Victoria, Australia. He claims that this image should be quicker than Raspbian.
<A HREF="http://www.linuxlinks.com/article/20150308093946362/Raspbian-Linaro-Benchmarking.html">Complete article</A>