There is one famous quote going around the Nginx community that summarizes the situation pretty accurately:
"Apache is like Microsoft Word, it has a million options but you only need six. Nginx does those six things, and it does five of them 50 times faster than Apache."
– Chris Lea, https://chrislea.com/
Other notable testimonies helped build the reputation of Nginx over time:
"I currently have Nginx doing reverse proxy of over tens of millions of HTTP requests per day (that's a few hundred per second) on a single server. At peak load, it uses about 15 MB RAM and 10 percent of my CPU on my particular configuration (FreeBSD 6). Under the same kind of load, Apache falls over (after using 1,000 or so processes and god knows how much ...