a smaller size would work better for this design
I suspect the vertical and horizontal dial dimensions of the dial (eg measuring just the crystal from 12 to 6 and 9 to 3) is the same between the nautilus and cubitus.. you can see the date window of the 1A and 1AR of the cubitus is already at the edge of the dial.
So to downsize the watch means, they have to reduce the bezel thickness.. which may make the watch look visually larger (eg thinner bezels usually make the watch look bigger)
I think the olive 1A looks the best.. I do like the grand date but the off center MP and sub seconds of the lower half doesn’t match the very balanced top half