A flexible & easy-to-manage web server... Internet Information Services (IIS) for Windows® Server is a flexible, secure and manageable Web server for hosting anything on the Web. From media streaming to web applications, IIS's scalable a...
Phusion Passenger - a.k.a. mod_rails or mod_rack - is a web server and application server, designed to be fast, robust and lightweight. Administration tools allow you to gain insight into web application operations and server performance.
IIS is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.
In terms of market share, Phusion Passenger is clearly lagging behind, losing to IIS in all segments.
IIS has better usage coverage in more websites categories. Including Science & Education, Computers Electronics & Technology, Law & Government, Finance and 20 other categories.
Phusion Passenger hasn't got a lead over IIS in any websites category.
IIS is leading in most countries, including United States, China, United Kingdom, Italy and 161 other countries.
Phusion Passenger is leading in Turkmenistan.