EV's missions seemed endless and pointless. Override's are interesting and actually make a difference. They have you take a some supplies to help production. After completing a few supply runs the station becomes operational. It goes from being nothing but an abandon station to a bustling place specializing in captured Voinian technology from plundered Voinian ships.
Override is huge.
Many times larger than in EV, it takes dozens of hyperspace jumps to get from end to end. It is populated with lush and beautiful worlds and barren, desolate worlds. In the beginning most of the worlds are forbidden from you. Such as most of the Strand worlds, they don't permit you to land until you join their side if you choose to. Override are new.