Share 'pure:dyne or Ubuntu Studio?'

I would like to set up a dual boot on my WinXP laptop with a Linux distro, and I am considering either pure:dyne or Ubuntu Studio. My primary applications at the moment are Csound, SuperCollider, and Audacity. But I'm interested in delving into other software as well, e.g., PD and Processing. Real-time capability is important. Any opinions on which of these distros might be better? Is there an...