It's also a whole lot more flexible. And will easily do full PCIe passthrough with some more advance configuration. virt-manager even works remotely over SSH if you have another machine you want to run your VMs on!
It's not entirely closed source, but the extension packs are. The other reason are the main one that should make you switch. Why use subpar software when there's a better, trusted by the entire industry, alternative builtin already?
It's subpar, closed source, kernel module installing, type 2 virtualization that makes users believe VMs are slow, when in fact Type 1 hypervisors usually achieve near 98% efficiency. And too boot it means that open-source projects like virt-manager don't get the usership they deserve and need to continue being maintained.
There is legit not a single reason to use it on Linux, and there hasn't been in well over a decade.
Proxmox runs KVM/Qemu in the backend, so it's essentially the same thing. OP might want to have a machine in their rack they use for remote gaming for example.
Happy Birthday!