Napster vs. ITunes.. Which is more secure?

["desert penguin" <desertpenguin007 () msn com>]

Greetings all,

Have begun a cleanup on a network in which many PCs were found to have 
iTunes, Napster and some other P2P programs which are obviously "no no's".  
I am leaning more towards allowing Windows Media player and iTunes, but what 
about Napster?  Now that they are legalized, are there insecurities with it- 
or is it pretty much on the same "level" as iTunes?  Is it good policy to 
allow WMP and iTunes and disallow Napster and say, BearShare, or would it be 
best to just restrict them all entirely?  Thank You