[WSG] is rgb(255,255,255) better than #ffffff or white?

[Alan Trick]

I was just reading through the Web authoring standards document at 
http://www.htmlhelp.com/design/standards.html and I noticed the line

Authors MAY use any legal markup to determine document colours, but 
SHOULD use RGB specifications to do so.

Does that mean that hex values or color names are not as good?  Why?
Alan Trick
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