You've stumbled on IP/OOP, one of the great tandem controversies. We try to be as perfectly IP as possible, occasionally get a tooth or two out due to sloppy maintenance - I can't say I've really detected much difference although I correct it as soon as I notice. I saw a tandem 90 degs OOP last week and it looked like the Captain and Stoker were going in different directions, would have driven me nuts, but this was a low end bike that looked pretty noodly, nothing like Zona's stiff carbon frame.
Next up, ask about crank length, gearing and tires - you will get a "range" of opinions