I have a client who has 3 websites running. There is the main website, and then 2 subsidiaries who run on the same domain. So main website is
example.com and the other two are
He did this because he believed it would be easier to optimize for a separate site. I am not an SEO expert by any means but I know that Google optimizes pages not sites, and I would have simply run with one website. These other 2 websites are for specific services that the company offers, but it's all within the same field.
My question: is there ANY reason that having separate websites to market specific services is more beneficial then dedicated pages to those services on the main website?