Looking for advice on hosting virtual Fedora on my Xubuntu system

I have a busy beowulf cluster of Xubuntu machines, one of which I sometimes reboot into Fedora just for one app I don't know how else to run: Fedora's six, which is useful because my project concerns strategy games. But I would prefer to stop rebooting in favor of running everything on Xubuntu..

I have two or three ideas, with several sub-plots, and I have not really explored them all. I could spend a lot of time on this, or ask if there's an expert here who can guide me. What I'm thinking so far:

• Recompile six on Xubuntu. The main hurdles here are that six depends on very old versions of Qt and KDE, which Fedora still supports but Ubuntu does not. I don't know if just finding libraries and rebuilding on modern Xubuntu is workable. If it is, it would be the ideal solution.
• Run Fedora in a virtual machine. I gather there are multiple ;choices for that. It could be simpler in some ways, but is likely more resource-intensive. But for starters, I'm not sure how to pick a VM
  
  1. VirtualBox -- I gather it's an Oracle product.
  2. Docker
  3. LXD
  4. Any others worth considering?
  
  
• Should I consider containerization instead?