The most valuable features of either of the SRM tools, were the reporting and real-time ability to show management that additional storage was required or in regards to who was using what storage and bandwidth.
All the attributes of the tool had real importance, when you needed time to create some reports for the management and to email those reports on a regular basis.
Room for Improvement:
By the time they rolled out its predecessor SMC and Unisphere, the old ECC was trying to do too much within a large enterprise environment.
We were unhappy as no one from EMC heard our plea for assistance and it became expensive in terms of the license and the amount of resources it took.
The stability of the products was very similar as well.
The scalability of both the products was pretty even.
The technical support was very good for both the NetApp OCI and the EMC ViPR.
It is at this time that we switched to NetApp's OCI. It was somewhat reasonably priced and easy to install with VMs, instead of all the physical hosts that EMC wanted at that time.
We were somewhat happy with OCI and it was less costly.
The ease of installation looked to be the same.
Cost and Licensing Advice:
The price was also about the same.
Other Solutions Considered:
Then I changed companies and we started looking at EMC's ViPR SRM. Upon examination, it looked very much under the covers like the NetApp OCI solution.
I am now with yet another company and they have purchased EMC ViPR SRM. I think I will be happy with it, provided that EMC listens to its customers and fixes issues, as it has grown-up.
Early on in history, the EMC Control Center was a very powerful tool and had many robust parts/pieces to it.
Disclosure: I am a real user, and this review is based on my own experience and opinions.