Honestly, whatever you go with, you should make sure it has KDE plasma, it has a graphical interface that more closely resembles Windows and can function as training wheels until you better familiarize yourseld with the terminal. If you're looking at Ubuntu, just be aware that you will likely find it irritating once you start understanding how the system works as it forces its own package manager, snap, which introduces a slew of difficulties in acclamaiting to the Linux ecosystem. However, snap does make installation easier for newcomers who may not understand how to identify dependencies for a given package they wish to install. With all of this in mind, Kubuntu is a really good option for first-timers as its a flavour of Ubuntu that comes with KDE Plasma out of the box.