On the desktop releases page, there’s a series of releases with version number 33.x.x (and 32 and so on) and a series with version number 4.x.x.
What, if any, are functional differences between the two? No need to give an exhaustive list, I just want to know if one version has specific advantages over the other, and if there is perhaps any difference in intended use.
It’s not a separate series or branch. They simply switched to semantic versioning to use the same versioning scheme as the server.
So 4.0.8 was the last release with the old versioning scheme, followed by 33.0.0, the first release with the new scheme, then 33.0.1 and 33.0.2, which is currently the latest version.