It’s not in a different league. I’ve used both in production. As others have said vSphere breaks down with thousands of VM’s, and worse the vSwitch implementation is buggy and unreliable as soon as you add more than a couple to a cluster.
> the vSwitch implementation is buggy and unreliable as soon as you add more than a couple to a cluster.
Next time try dSwitch (distributed switch) instead of vSwitch. It's designed for cluster use and much more powerful (and easier to manage across hosts). Manually managing vSwitches across a cluster sounds like torture.