At this point, we're quibbling over small imperfections and that's why I choose Scorpion II, a little less good than the two others.
Scorpion I - 0
Living Witness - 0
Scorpion II - 1
Scorpion I - 0
Living Witness - 0
Scorpion II - 1



And Seven is one of Trek's best new characters, if not sci-fi in general. Certainly 90s sci-fi. (Though Sela was better conceptually. In overall handling after the setup/big reveal, Sela was so poorly scripted... unlike Seven until season seven...)