Does Genymotion Desktop work on macOS Catalina, and should I use QEMU or VirtualBox?
Genymotion Desktop on macOS Catalina should use QEMU, not VirtualBox. If you are on a Mac M series or a virtual machine, Catalina is not the right setup for Genymotion Desktop.
Details: on macOS, QEMU is the default and recommended hypervisor, while VirtualBox is only for older Intel Macs and is not available on Mac M series. Get Started with Genymotion Desktop macOS - An error has occurred while trying to create a virtualbox host-only network interface