Paranoid, but not by much. I have always liked Purple more than Sabbath, that won't change no matter how this series of polls go.
Now this is going to be a much more interesting matchup. "In Rock" for me. While "Paranoid" might be one if not the most iconic metal record of all time I have to choose the Purp here. "In Rock" is a much harder rocking album with a whole lot more aggression and energy.
I absolutely love In Rock, but Paranoid is a heavy metal masterpiece. I voted for BS, but I would love if In Rock wins this poll.