Apache HTTP Server vs CometD

I was in a situation where I have to configure 40 RHEL servers 20 each for Apache HTTP Server and Tomcat server. My task was to

1. configure LVM with required logical volumes, format and mount for HTTP and Tomcat servers accordingly.
2. Install apache and tomcat.
3. Generate and apply selfsigned certs to http server.
4. Modify default ports on Tomcat to different ports.
5. Create users on RHEL for application support team.
6. other administrative tasks like, start, stop and restart HTTP and Tomcat services.

I have utilized the power of ansible for all these tasks, which made it easy and manageable.

I am diving into web development, both front and back end. I feel comfortable with administration, scripting and moderate coding in bash, Python and C++, but I am also a Windows fan (i love inner conflict). What are the votes on web servers? IIS is expensive and restrictive (has Windows adoption of open source changed this?) Apache has the history but seems to be at the root of most of my Infosec issues, and I know nothing about nginx (is it too new to rely on?). And no, I don't know what I want to do on the web explicitly, but hosting and data storage (both cloud and tape) are possibilities.
Ready, aim fire!

From a StackShare Community member: "We are a LAMP shop currently focused on improving web performance for our customers. We have made many front-end optimizations and now we are considering replacing Apache with nginx. I was wondering if others saw a noticeable performance gain or any other benefits by switching."