Technical/Programming/Non-SEO Pros and Cons of WWW or no-WWW?

Posted by Ingenutrix on Stack Overflow See other posts from Stack Overflow or by Ingenutrix
Published on 2009-05-08T09:55:36Z Indexed on 2010/04/03 16:03 UTC
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www

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no-www

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subdomain

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non-seo

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bare-domain

What are technical/programming/non-SEO pros and cons of www or no-www, for domains as well as sub-domains?

From Jeff Atwood's twitter at http://twitter.com/codinghorror/status/1637428313 :
"sort of regretting the no-www choice because it causes full cookie submission to ALL subdomains. :("
What does this mean? Is there a blog post or article detailing this?

What other specific issues and their reasons should be considered for www. vs no-www.

Update:
On searching for more info on this topic, I found following helpful ( in addition to Laurence Gonsalves answer ) :

Dropping the WWW Prefix
Impact on search results: Jivlain's and Isaac Lin's comments
Use Cookie-free Domains for Components
on StackOverflow : Should I default my website to www.foo or not?
on StackOverflow : When should one use a ‘www’ subdomain?

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