None of this provides anything unique in the game. There are no exclusive gameplay sections or features associated with the choice, the plot doesn't change significantly due to the choice, there's no unique ending tied to the choice, heck, there's not even a single unique conversation/cutscene tied to it. Collector Base choice wasn't properly addressed under any, even most liberal criteria of adequate C&C resolution.
The Collector Base decision was definitely one of the things that irritated me the most about ME3. Such a massive choice, and it gets about the same amount of dialogue and EMS shift as Conrad Verner's quest 
Wish it would have played a much bigger role, especially for the ending. I personally had an idea in which destroying the Collector Base resulted in an MEHEM type scenario (because of the heart's power it can destroy the Reapers, but will also damage tech badly (like original ending), geth and EDI saved), vs. saving the Collector Base, where the brain would interface with the Citadel and act like the Catalyst, only with a different context and dialogue. It explains the choices, says it's like a child who has not yet been implanted with the programming of his older brothers, tries to find a solution. Same choices as EC, except Destroy would now only badly damage the reapers, geth and EDI destroyed, tech is damaged EC style (think of this as Destroy-Lite version).
Would have been cool, but you can't have everything unfortunately 