Both gnome-boxes and virt-manager use QEMU under the hood though, and they provide a point-and-click experience. I use virt-manager myself and I do not think it's any more difficult than VirtualBox is.
Everytime I tried to migrate to qemu or virt-manager or gnome-boxes it was a real nightmare especially installing SPICE+virtio drivers+ networking. I read in Phoronix the performance of virtualbox is subpar and all KVM/qemu is the way to go.
Please, could the OSS community build a easy to use GUI that SPICE+virtio drivers+ networking is made simple. Any one from qemu, I really appreciate the work but still very challenging for sysadmins.
The problems I did have were with VMs I tried to convert from VMware to KVM, and those stemmed from Windows' inability (version 7) to properly handle changing hardware. Perhaps it's better at nowadays.
The exercise was a good (and incremental) learning experience and increased my general networking and sys-admin knowledge, which I've used well as part of my software engineering career. I would have been lost in many professional situations without it. QEMU/KVM are awesome.
EDIT: more and better words
https://www.spice-space.org/download.html
It will contain everything you need for a fairly seamless experience on windows, and libvirtd and virt-manager make host side a cakewalk as well.
I would say forget spice + libvirt graphics layer. Use RDP, if on linux remmina work's great. RDP will outperform in my experience SPICE. I've also had constant troubles with the vga/qxl/virtio graphics.
Secondily for virtio: https://docs.fedoraproject.org/en-US/quick-docs/creating-win...
There is an iso at the above link. Grab that and have it added during install. When you get to the select a drive. None will show up until you load the virtiostorage driver.
There are a lot of nuances to first setting up a windows vm. But the performance is great. It has removed the need for a windows install for gaming at all.