Proxmox is fine if your vmware deployment was quite small. Single oxide rack at max density is going to similar values as official scaling sizes for proxmox, and very much isn't limit of what we did with vsphere.

And Oxide sells a complete hardware + software solution, including virtualization and SDN - essentially it's a physical equivalent of up to 32 node virtualization cluster per rack, with builtin SDN and SD-SAN, that already has features to combine for more.