This is an interesting article comparing FlexPod and Vblock. But the key is in this paragraph:
For the largest pure-play storage vendors, EMC Corp. and NetApp Inc., having integrated bundles requires partnering for the server virtualization and networking resources. Both storage vendors have turned to VMware and Cisco as partners, but they bring their prepackaged bundles to market in different ways.
Either way, Cisco UCS wins. Go UCS!