Originariamente inviato da lozmatic
Secondo me dipende da quanto diversi siano i contenuti del blog.

Matt Cutts, Un Product Manager di Google, dice nel suo blog:

"My personal preference on subdomains vs. subdirectories is that I usually prefer the convenience of subdirectories for most of my content. A subdomain can be useful to separate out content that is completely different. Google uses subdomains for distinct products such news.google.com or maps.google.com, for example. If you’re a newer webmaster or SEO, I’d recommend using subdirectories until you start to feel pretty confident with the architecture of your site. At that point, you’ll be better equipped to make the right decision for your own site."

Ovvero, se si hanno prodotti completamente diversi (eg. Google Maps) allora e' meglio usare un sottodominio.

Wordpress e' ottimo ma dai un'occhiata a TextPattern.
la scelta esula dal posizionamento... per quello sarebbe sost indifferente visto l'uso