Depends on what one wants to do and theirs personal preferences. For a beginner I would recommend Kubuntu, but a more experienced user might want Debian, Arch or something else.
Discussion
I’m not quite a beginner, because I dual booted an old laptop with PopOS, but I didn’t quite do it right, so I couldn’t switch back and forth. Went into windows for some reason and couldn’t figure out how to get back to Linux (didn’t really try), I got a gaming PC shortly after.
I’m considering dual booting again. Linux makes me feel quirky and unique lmao