How does one judge communication advantage?

The big issue with a 3 man premade vs a 2 man premade, is how do you judge the advantage that the extra person of communication gives you? In my experience it's rather substantial. Still want my beloved SoloQ, I might come back and spend money Riot. Else E3 is coming up soon, can't wait, I am sure it'll offer places to spend extra cash.
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