I’ve quietly built a proxmox cluster in our environment for semi-prod workloads for when the inevitable windows host has issues.
Hyper-V could have been used in many instances. I know a few places that chose to start moving to Nutanix even before the Broadcam fiasco. OpenStack is useful for many large scale environments (especially with tenant isolation and usage tracking/billing/chargebacks).
Proxmox is good a good solution for SMBs, but (especially pre-9.x) there were a bunch of things that made it much less usable for large(r) scale deployments IMHO.
It does help that I have thirty years Linux experience compared to the paltry twenty five or so of VMware (which was RedHat plus stuff back in day)
I also have rather a lot of Hyper V exposure too and I defy you to love its iSCSI and networking, let alone that awful vTPM thingie.
It's Proxmox for me, any day. Even when I've completely knackered it I can always boot a systemrescuecd and mount and chroot the thing back to life.
> VMware to Proxmox migrations are not affected ...
Amusingly - and acknowledging tiny scale and modest automation requirements of home lab compared to enterprise - as I started migrating to Proxmox a year or two ago, the process of shuffling VMs off my ESXi servers and onto Proxmox was surprisingly painless. Effectively mount the ESXi as storage systems, and then 'copy to here'.
IIRC the only small challenges were a conservative choice on target VM's CPU type (Proxmox seems to dislike defaulting to 'host' CPU) and the network / SCSI controller defaults. I assume designed to prioritise robustness over performance.
All automatable, I'm sure.