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I'm thinking of creating a family of websites which use the same engine, but target different topics.
Given the choice is it better to have somekeywords.com, somekeywords2.com or myotherwebsite/some-keywords, myotherwebsite/some-keywords2.
For example: stackexchange.com/stackoverflow stackexchange.com/askubuntu instead of stackoverflow.com

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The best is the shortest and the easiest address to be remember by your users.

By my side, my favorite practice is usage of sub-domains:

  • undersite.parent.invalid
  • undersite2.parent.invalid

BUT, a lot of users want absolutely put WWW before when I stated orally (for example, by phone), so, I always make an other sub-domains like this with redirection just for this purpose:

  • www.undersite.parent.invalid
  • www.undersite2.parent.invalid
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