[In SEO point of view for better google ranking what is better to use WordPress sites or HTML ?? I want to create a simple informational site and I want to get it nr one on google for his domain name keyword.]
WordPress renders as HTML. Search engines do not care if it is WordPress, any other CMS or editor, nor hand-coded or scripted markup, search engines see it all as HTML.
It’s not the tool, that makes the difference, it is the techniques you choose to employ.