Talking to midmarket and enterprise customers and nobody is taking Proxmox seriously quite yet, I think due to concerns around support availability and long term viability. Hyper-V and Azure Local come up a lot in these conversations if you run a lot of Windows (Healthcare in the US is nearly entirely Windows based). Have some folks kicking tires on OpenShift, which is a HEAVY lift and not much less expensive than modern Broadcom licenses.
My personal dark horse favorite right now is HPE VM Essentials. HPE has a terrible track record of being awesome at enterprise software, but their support org is solid and the solution checks a heck of a lot of boxes, including broad support for non-HPE servers, storage, and networking. Solution is priced to move and I expect HPE smells blood in these waters, they're clearly dumping a lot of development resources into the product in this past year.
My personal dark horse favorite right now is HPE VM Essentials. HPE has a terrible track record of being awesome at enterprise software, but their support org is solid and the solution checks a heck of a lot of boxes, including broad support for non-HPE servers, storage, and networking. Solution is priced to move and I expect HPE smells blood in these waters, they're clearly dumping a lot of development resources into the product in this past year.