Quick recommendations
- **Ubuntu 24.04 LTS** — default choice. Largest community, fastest answers on Stack Overflow, every guide assumes it.
- **Debian 12** — Ubuntu's upstream. Slower-moving, slightly smaller, identical commands. Pick if you value stability over newness.
- **Rocky Linux 9 / AlmaLinux 9** — RHEL-compatible. Best if your team already runs RHEL or your app vendor only supports it.
- **Alpine 3.19** — Tiny (5 MB), musl libc. Common for container base images. Surprises: `apk` instead of `apt`, no glibc, no systemd.
- **NixOS 24.05** — Declarative, reproducible. Steep learning curve, immense payoff if you adopt the model.
Things that often surprise people
- **systemd is the same** across Ubuntu / Debian / Rocky / Alma. Skills transfer cleanly.
- **`apt` vs `dnf`** is mostly a syntax difference; concepts (packages, repos, dependencies) are identical.
- **Alpine + glibc binaries** = pain. If you're running Oracle's JVM, Chrome, or a proprietary VPN client, don't pick Alpine.
- **Long-term support cycles** matter. Ubuntu LTS gets 5 years of security updates; Debian about the same; Rocky 10. Don't pick a non-LTS Ubuntu point release.
Switching later
You can reinstall a v4vm VPS with a different OS from the dashboard without losing your IP allocation. Plan ~3 minutes of downtime per reinstall.