The ultimate NUC for a vSphere lab is the "hades canyon" NUC8i7HVK. I have three of them in a vSAN cluster.
* dual NVME drives for all NVME vSAN
* dual nics work out of the box for ESXi
* dual thunderbolt 3 ports to enable 10GbE via TB3 adaptor or PCIe expansion
* Linux friendly AMD GPU that has no problems being passed through to a nix or win vm
* low profile and easily stackable for a rack shelf
* Supports 2x32GB SODIMMs
* Power efficient
* Low noise
Love these things!