[jQuery] CNN and Apple Choose Prototype. Why?

[jQuery] CNN and Apple Choose Prototype. Why?


Two stories today from Ajaxian (Ajaxian.com) caught my eye and made me
curious:
CNN Beta Site:
http://ajaxian.com/archives/cnn-beta-site
Apple Revamps Its Website
http://ajaxian.com/archives/apple-revamps-its-website
In both cases, Apple and CNN have gone with Prototype and
Scriptaculous. I should say up front I'm a big fan of jQuery and
Interface, but I'm wondering why two big sites like this would adopt
Prototype when other high-profile sites like Technorati have adopted
jQuery.
Are there any standard arguments for Prototype that I don't know
about? Or is it simply a matter of preference and that's all? Just
curious.