If your site requires no updates, regular changes, or any additional content, HTML is a better choice as it will make your website perform faster. If you want to grow your business website and constantly update it, then WordPress is the best choice.
Again, it all comes down to what your site's purpose is. If you are certain that you will never want to update, change, or add anything new to your website and that the site will most be static and unchanging, then an HTML5 template website is the better choice. It will be faster and will serve its purpose.