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I am a Joomla moderator, so obviously am a bit biased on my opinion

But you can do much the same in Wordpress too. So really this matter should not drive your choice of CMS. What should drive your choice is your experience with using the CMS, a lot of members struggle switching from one Wordpress to Joomla or vice-versa.
As far as Ads go they're almost certainly provided through a third-party service anyway and any analytics aggregated against the domain name (site) anyway so I don't see that as a reason for trying to share databases between sites.
Regards, Mark.
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