I just looked them up and maybe you are right. But QEMU definitely lacks a GUI config tool that is both easy to use and allows for advanced features like snapshots. So far the only ones I know is GNOME Boxes and Virt Manager, and neither is as good as providing handy ways to configure as VirtualBox. I could probably just write the XML config or QEMU command by the documentation, but next time it could be a different scenario so I have to investigate the docs and maybe a few more forum posts. In VirtualBox, the buttons that do everything for me are always there