Also, I’d say of the three, if you want the one that will “just work” the most, I would go with Kubuntu, mainly because you’ll be able to search for stuff and problem fixes easier since there’s a lot of info online for it, because it’s the most commonly used of the three I believe. The other two are still perfectly fine options though, but I think Kubuntu would be the smoothest experience, as you said you were still a bit new to Linux in your post.