as always, highly depends on your personal needs. I'm a huge Proxmox fan, but there're of course several different cool solutions. Next to #Proxmox, I also often use #incus [0] in personal labs but I'm also a huge fan of #XCPng with #Orechstra. #SuseHarvester 's [2] approach is also a great solution (similar to #Platform9) if you want to go into the modern world (in the end, they're also using KVM). If it's just single node, I really would also consider #bhyve on #FreeBSD (maybe even via #ClonOS / #cbsd).

[0]: https://gyptazy.com/incus-for-containers-and-vms-a-powerful-proxmox-alternative-a-step-by-step-guide-to-build-a-cluster/
[1]: https://gyptazy.com/blog/xcpng-a-more-professional-alternative-to-proxmox-based-on-xen/
[2]: https://gyptazy.com/blog/harvester-a-more-modern-alternative-to-proxmox/

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