Whether websites with '.com' are given more prominence by Google, from SEO perspective than the websites with suffixes, viz., '.info', '.net' and '.us'.
I seldom find a .info in the first page of search results. An info web site's content has got to be something pretty special in order to overcome the prejudice the search engines has for the extension. Dot info spammers long ago lost favour with the search engines.
A dot us domain, under certain circumstances, could be advantageous for regional search.
I consider a .net slightly disadvantaged over the dot com. Although a .net can easily be made into a decent SERP (search engine results pages) performer.
I am not sure what's a dot viz so I'll go away now.