VirtualBox is ridiculously simple to set up and get virtual machines going. Shared folders, shared clipboard and much more are no issue.
But.
It eats resources. The installed virtual machines (VM) run relatively slow. What have you found to be feature comparable - and most importantly more resource-efficient - alternatives for running VMs under Linux?
VMware workstation is free, it’s not open source but it’s faster than VirtualBox, if you want GPU passthrough KVM is the only choice but require quite bit of effort to setup