Cisco IOS, presently in its 15th edition, is a network operating system for service providers and enterprises alike.
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Ubuntu
Score 9.0 out of 10
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Ubuntu Linux is a Linux-based operating system for personal computers, tablets and smartphones. There is also a Server version which is used on physical or virtual servers in the data center.
Well suited for building management networks across the organization as it has been reliable without much downtime. Since it has great switching qualities, it suites well for data center and end-user connectivity using access switches. It might not be the best for routing, as other XOR software has proven to be superior for routing.
If somebody whishes to be an IT professional, learning the basics of Linux is amust. Ubuntu [Linux] is one of the most beginner-friendly, widely supported, easy-to-use-relative-to-the-fact-that-its-still-linux OS on the market. As somebody who learned the basics of UNIX/LINUX on Ubuntu, it was a very good experience. It is customizable, has a lot of improvements over the years, and live up to be a viable alternative to any modern OS in 2021 as well.
We did not use the managed commercial support, but instead relied on community forums and official documentation. Ubuntu is very well documented across both instructional documentation from the developers themselves as well as informal support forums [ServerFault, YCombinator, Reddit]. It's easy enough to find an answer to any question you may have
We have found other Cisco software to be filled with added functionalities as compared to iOS. New NCS software has certain programmability features that are advantageous to legacy iOS software but are more complex to use for some users. Hence, we still have most areas of the network that functions using iOS software.
Windows 10: Expensive, with more security problems, more difficult to keep updated and less variety of free / open source applications. Its use encourages bad information security practices. OpenSuse Linux: A different distribution at source (Suse Linux), use of rpm packages (with fewer repositories and incompatible with Ubuntu Linux dpkg packages), and whose main objective is to be a "testing ground" for its paid version / professional, SUSE enterprise Linux.
Systems administration with Ubuntu is easy with little deep knowledge about it. Docs and community publications are great resources for any task you need to perform on any Ubuntu server and the organization can save several salaries of specialized sys admins in favor of more active roles.
Having been an Ubuntu user for many years personally, setting up new Ubuntu servers on my organization came with zero cost for me. I just deployed one instance from my hosting/cloud provider and started working right after it was running, no need to ask support or hire new staff for these tasks.
Replacing paid options with Ubuntu have also saved thousands of dollars on Windows Server licenses. I've migrated Windows/SQL Server based systems to Ubuntu/MySQL/PostgreSQL several times during my career and saved about USD 5000/year in licenses to many of them.
