We have been building websites since 2000, and responsive websites since 2013. 'Responsive' sites 'respond' to a screen's size and automatically resize to fit, even changing in real time when a smartphone or tablet is rotated from portrait to landscape orientation. Such sites, also known as 'RWD' sites (for Responsive Web Design), are preferred by search engines. With all other factors taken into account, an RWD version of a site will always outrank an equivalent non-RWD site.
Below is a portfolio of websites that span simple information sites, to blogs, to database-driven sites, to ecommerce sites.