One of Google's ranking factor for SEO is the Accelerated Mobile Pages (AMP). This is because AMP pages load faster. But their tweak is that this rating element only adds Mobile SERP values for (search engine result page).
That means, if you have AMP versions of your web pages, relative to desktop SERP, there's a high probability of it being rated higher on Mobile SERP.
Search Engine likes websites that load easily and gives users a seamless user interface since it is quite easy to use by visitors.
Read more on How Google AMP improves the SEO of a website?