I have seen operating systems like Elementary OS, Pear OS, Cromixium OS, etc. but they last little since in the end they do not have support for new versions of software and the user ends up changing system.
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There is a kind of contradiction between wanting a stable distribution and new versions of software. The stability of the distributions is based on the fact that its software is hyper-controlled and has no faults (rather, it has not been found), and that takes time, therefore, it is not the new versions that contain those distributions. But going promptly to the query: the stable branch of Debian.
The most stable are those used in servers, because they need something tested, these are, for example, should or centos, on the stable branch, which is the most tested of all. What is the problem? Programs that there are on those versions are old, like a year behind of other distributions, this on a server gives you the same thing, but for a home computer, therefore it is best to have the latest versions. In this case I would recommend ubuntu, which is based on should be, and it is stable, but at the same time it has the latest programs.