Amazon Web Services is the more common of the two in our index: it runs on 39,236 websites against 1,784 for WP Engine, and 855 sites use both. Counts come from real scans of each site's home page, not vendor claims, and cover the sites in TechLookup's index rather than the whole web.
Amazon Web Services (AWS) is a comprehensive cloud services platform offering compute power, database storage, content delivery and other functionality.
WP Engine is a website hosting provider.
Within the paas sites we have indexed, Amazon Web Services holds 81% and WP Engine 3.5%.
855 sites run both Amazon Web Services and WP Engine. That is 48% of the sites using WP Engine, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.