Thank you for telling me this point. :) Just feels so odd that a 2x2 can often be 30% cheaper than a 1x2 brick, in light bluish gray for example. I also thought that the 2x wide is more stable, and thus works better if you use the old 45 degree slopes as roofs & need a support structure under it. One other plus side with 1x wide is that they take up half the space in storage/shipping.
Maybe the bigger you are making the buildings the better the 2x wide choice is...