Windows: Windows 11 is a mixed bag with some better design and some worse. Currently, it's a bit of a step backwards. Windows 10 is pretty ok though.
Ubuntu: I wouldn't say Ubuntu is in a better place now with Gnome than it was 5 years ago. It works well, but it doesn't have the cool factor that Unity did and is missing a lot of its features. Ubuntu Unity exists, but it's a little buggy and not as polished as back in the 16.04 days. You could always go KDE Plasma (or MATE if you're old school).
There's the rabbit hole of other Linux distributions, my favorite alternative being Arch. But depends on your tolerance for tweaking.