Comparing Linux Distributions

Linux comes in many distributions, each maintained by a different organization. These notes capture what I understand about the differences between some of them.

Why is this worth a standalone post? Because the distribution you pick at install time largely determines your operations experience for years to come: which package manager you use, how fresh the packages in the repos are, whether the system can roll forward or only migrate across major versions, and how easy it is to find community documentation when something breaks. These differences are barely noticeable day to day, but they all come crashing in the moment you're troubleshooting production or upgrading the OS. Sorting out the main distributions' characteristics up front is far cheaper than switching systems after things go wrong.

Some background first: every Linux distribution is essentially "the Linux kernel + a package management system + a set of default software and configuration." The kernel comes from the same upstream for everyone; what really sets distributions apart is the packaging ecosystem (the Debian family uses apt/dpkg, the Red Hat family uses yum/dnf/rpm, the SUSE family uses zypper/rpm) and the release policy — whether they chase stability, freezing software versions for years, or chase new features with frequent updates. Once you understand those two axes, the trade-offs below become easy to follow.

Debian

1. Debian is my favorite distribution to use right now. Version 10 is rock solid and the system footprint is tiny. It's my current choice for production.

Debian's stability comes from its release process: packages go through long periods of hardening in the unstable and testing stages before they reach the stable branch; once stable is released, software versions are essentially frozen and only receive security patches and critical fixes. The price is that repo versions skew old, but in exchange you almost never see an "update broke the system" incident on a server. On top of that, the default install is extremely minimal — no unnecessary preinstalled services — so memory and disk usage stay modest. That's the main reason I run it in production.

Debian -- The Universal Operating System

CentOS

2. CentOS was Red Hat's free spin of its commercial operating system. Its features and stability are quite good, though something has surely been trimmed somewhere — after all, they still sell a paid system. CentOS has since stopped being maintained, and its original creator, Gregory Kurtzer, has launched a new project: Rocky Linux.

A bit more on that history: CentOS originally took the open-source code of RHEL (Red Hat Enterprise Linux), rebuilt it, stripped the trademarks, and released it for free — which is why it was highly compatible with RHEL and why many companies used it as free RHEL. Red Hat later changed course and turned CentOS into CentOS Stream, flipping it from a "stable downstream rebuild of RHEL" into an "upstream rolling preview of RHEL." For production users who valued stability, that changed the deal entirely. The community responded with successor projects like Rocky Linux and AlmaLinux, which continue the old downstream-of-RHEL compatibility route. If your existing workloads are deeply tied to the CentOS ecosystem, migrating to one of these successors is usually much cheaper than switching to the Debian family.

The CentOS Project

Ubuntu

3. Ubuntu is built on top of Debian. It is richer and more powerful in features, but its stability and resource usage fall well short of Debian.

Ubuntu is led by Canonical and makes more aggressive choices on the Debian base: newer software versions, broader driver support, a desktop experience that works out of the box, and LTS (long-term support) releases on a fixed cadence. Its sweet spot is desktops and development machines — new hardware gets supported quickly, the community is huge, and almost any problem you hit already has a ready-made answer online. But because it preinstalls more components and runs more default services, the same hardware will burn more resources than under Debian; for a server that only runs a handful of services, all that "richness" becomes a burden.

Enterprise Open Source and Linux | Ubuntu

openSUSE

4. openSUSE is said to be the most popular operating system in Germany, and its stability is reportedly excellent. I'll try it out against Debian when I get the chance.

Behind openSUSE is SUSE, which follows a "commercial edition + community edition" model similar to Red Hat's. Two features are worth mentioning. First, YaST, a graphical system administration tool that gathers networking, partitioning, and service configuration in one place — very friendly if you'd rather not hand-edit config files. Second, it ships two tracks: Leap (fixed releases, aligned with the commercial SLE) and Tumbleweed (rolling release), so you can choose stability or freshness as needed. Relatively few people use it in China, and Chinese-language material is harder to find than for Debian/Ubuntu — something to factor into your decision.

SUSE - Open Source Solutions for Enterprise Servers & Cloud

Pitfalls and Caveats

1. Never run an end-of-life system in production. A distribution without security updates leaves you exposed to every newly disclosed vulnerability — the CentOS saga is a fresh reminder. Check the support lifecycle of a release before you commit to it.

2. Migrating across distribution families is expensive. The differences between apt and yum/dnf go far beyond command names: package naming, how packages are split, and config file paths all differ, and your scripts and operational habits have to change accordingly. Migrating within a family (say, CentOS to Rocky) is much smoother.

3. "Fresh software" and "stable system" are at odds most of the time. If you need newer software on Debian stable, prefer the official backports repo or containers; avoid mixing in third-party repos to force upgrades, which easily wrecks the dependency graph.

Wrapping Up

None of these distributions is absolutely better than another — it's all about matching the scenario. For servers where stability and a small footprint matter, I pick Debian. If you're heavily invested in the RHEL ecosystem, look at CentOS successors like Rocky Linux. For desktops and dev machines, Ubuntu's out-of-the-box experience saves the most hassle. openSUSE I'll leave for a hands-on comparison later. Picking one family and getting fluent with its package management and release rhythm is worth far more than hopping between systems.