MainWP vs. WP Engine

MainWP is a suite of open-source self-hosted plugins and Extensions for users with multiple WordPress sites who want to control them from one central location. This includes sites on different hosts or servers. Once you have connected your sites (called Child Sites) to your Dashboard, you can do almost anything from your MainWP Dashboard that you would be able to do from your Child Sites wp-admin.

WP Engine is a global web enablement company that provides premium products and solutions for websites built with WordPress. WP Engine's platform is engineered to deliver high performance, robust security, and specialized support across all types of WordPress installations. WP Engine manages complex technical aspects—from proprietary caching to automatic maintenance—allowing businesses, agencies, and developers to focus on content, innovation and business growth. The service is a highly scalable solution designed to power and protect critical web projects.