For cases where you just want to install it once and then update only once a month or even a couple months, and not worry about the distro not being maintained, I’d highly recommend installing Debian. You will eventually have to reinstall years down the line when a new major release happens, but it is many many years down the line and even that can be put off for quite a long time. The only drawback is that the latest releases of the software you like aren’t always available in the official repos, as Debian’s MO is to vet every package for stability before releasing it via their repos.

If you want a slightly less stable distro that has almost all the packages in the world and is up to date and is going to be around for a long time, go with Arch Linux. It’s a rolling release model so packages are updated as soon as they are made available by the distribution maintainers. Things do break occassionally on Arch and a familiarity with the command line and where to go research/ask questions (the Arch Wiki and Arch Linux Forums) is very much needed in those situations. But Arch is very widely used and established nowadays and is a fine option if you’re okay with the rare package that breaks.

Gentoo is a great option if you simply want to customize every aspect of your system, but it’s considered an “advanced” distro and usually some familiarity with a different distro is recommended before using Gentoo, though some do end up using Gentoo as their first and only Linux distro. Gentoo, like Arch, is rolling release. Unlike Arch and Debian, packages are compiled from source, giving you granular control over which features of every piece of software you want to have and the ability to omit those features you don’t want/need. Gentoo is as stable as you make it. Like Arch and Debian, Gentoo isn’t going anywhere. That said, imho, Gentoo requires more maintenance than Arch or Debian, and potentially a little bit more knowledge of Operating Systems.

Other distributions like OpenSuse and Slackware are fine options as well as they have a very long established history in the Linux Distro ecosystem, but I am unfamiliar with them, so will leave it to others to make their comments/recommendations regarding them.