Subdomains v Subdirectories

[findlite]

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Bonjour

Just wanted to start a debate about this cos im starting to branch out from just offering Cardiff airport parking to offering at other airports too.

In your view what would be better:

gatwickairport.airportparking.com

or

airportparking.com/gatwickairport.html

Also, do subdomains get treated as a new domain (ie:sandbox etc etc) or do they inherit some form of pr/kudos by being a part of an already high performing site?

Thanks!

Btw the links listed are for demonstration, they aint my sites!

[attilakhan]

I prefer to use subdirectory, it looks more regular for people, but for SEO concern, subdomain seem has higher scores than using subdirectory.