Nexus tower vs Inhib?

I was just wondering what people think is more important. Obviously if i can finish then ill leave the inhib and take the nexus towers and the nexus. But what if i know we cant finish and i can take either. The tower leaves the nexus moire exposed which obviously will open more opportunities. Taking the nexus though will add more pressure to them if they manage to come back cause of the super minions... I was hoping to get some insight.
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