VMware vSphere vs. Microsoft Hyper-V: Which is cheaper?

Here are the few good articles I found on comparing the Price over the features on Hyper-V and vSphere,  which one is better choice

1.  VMware vSphere vs. Microsoft Hyper-V: Which is cheaper?

2. Microsoft, VMware offer deep discounts to gain virtualization market share

3. VMware vs. Microsoft: Cloud management is the new battlefield 

4. Are Hyper-V savings worth the cost of a VMware rip and replace?