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I wouldn't necessarily agree with that, probably depends on your search term. For SEO as a search term here in the UK I am getting 6 with www., 2 without and 1 using another subdomain. For "us election" all but one use www (the one that doesn't uses another subdomain). I am not aware of any preference by Google, however, you should be consistent in your use (in canonical tags, sitemap etc), and make sure the one you don't opt for 301 redirects to the other.

Thanks for your attempt I would like to proceed this discussion! hope I will get the best answer from Moz Community.

Thanks everyone for the response and Bernadette Coleman I felt this conversation healthy and useful for me. Thank you so much yeah Miriam I will