It's disappointing to see that a couple dozen people decided to hit your post with drive-by downvotes, rather than using their words to express themselves in a way that actually contributes to this community.

Your question is a legitimate one, and relevant at a time when Windows is increasingly bloated and invasive, spyware is out of control, and Linux is increasingly a viable alternative even in certain tough areas like games. I just wish you had elaborated on why you singled out Ubuntu when several other widely-supported Linux distributions exist.

If those were my only two options, I would pick Ubuntu over Windows, no contest. I would replace its default desktop with KDE Plasma (or just choose the Kubuntu variant in the first place), rip out as much of Snap as I could, update the kernel, and plan to migrate to a distro that I like better whenever I was able.

For what it's worth, Debian Stable with a few hand-picked backports and flatpacks suits me well, mainly for gaming and software development. (I'm a bit of an outlier among Linux users who post on social media, though: Having my system be low-maintenance is more important to me than always having the latest features in every app, and I've been known to make my own debian packages and flatpaks when something I want isn't ready-made.)

Linux Mint, Pop_OS, and Arch Linux are also popular. There are quite a few more.