I’ve worked extensively with both virtualbox and kvm/qemu. While I prefer kvm since it’s open source, I could never reproduce the video performance of virtualbox. I’m not even trying to game, just use regular applications that I cannot run under Linux.
I wonder if I’m missing something.
I love zfs. Started using it for my data storage pool and now I have it on root as well. It has some rough edges but overall it is very stable and has amazing features.