Many will choose subfolders as standard for branding reasons e.g. bbc.co.uk/xyz and because people don't uderstant subdomains they expect it to be www. However, if you need to built out your web presence using additional servers or different service characteristics you may be forced to use subdomains e.g. search.bbc.co.uk and news.bbc.co.uk
But for you and me it probably doesn't matter that much I do both - depends which I favour at the time : )
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