The 4 seats in an individual car (2 guests in each of 2 seats per car)
are all
very close together.
I would absolutely do 2 and 1, for the reason of comfort (the "middle person" in 3 per seat
would be VERY uncomfortable, with a sharp raised wedge in her/his back.)
Plus, there's the mentioned
guest photos used on the view-screens, designed for a maximum of 2 per seat, 4 per car.