Ubuntu vs. Parted Magic - Battle of the Live CDs

[TheChosenSphinx]

Which Live CD do you guys prefer, Parted Magic or Ubuntu, and why?

If you have a different preferred Live CD, such as Knoppix or Super OS list it, and tell me why you prefer that one.

 

[WinXPert]

PC Linux OS and Puppy Linux (which I use GParted)