Search engines reward web sites that they feel are more user friendly. In matching your link text to your page titles and file names, navigating through your site, from a users perspective, becomes very clear.

For example SiteA uses the link text contact a search engine optimisation consultant to link to their contact page. A good page title for the contact page would therefore be 'Contact a Search Engine Optimisation Consultant'. It would then be beneficial to name the file for the page contact-a-search-engine-optimisation-consultant.htm.