it's quite proven Google will give preference to WordPress sites, I think the main reason is Google Blog Search.
This being said, WP can be well built in terms of SEO (and no offense, but I highly doubt your CMS is as well constructed as SEO based WP sites in terms of SEO) or it can be average, but it's pretty difficult to make it horrible unless you have a custom theme made by a retarded.
Just think about this, for starters: do you have an automated way to let all the main SE know you have changed your site? Do you have a perfectly built sitemap regularly sent to Google? Well, in WP it's almost default And that's just for starters, let alone semantic building, logical structure, taxonomy, and so on and so on and so on. And finally, the WP badge, which, as you have noticed, has some weight.
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