I would expect that the upfront infrastructure cost for a monorail is much higher. However, the monorail trains themselves should be cheaper. So if you know it

I would expect that the upfront infrastructure cost for a monorail is much higher. However, the monorail trains themselves should be cheaper. So if you know it will be a busy line the monorail should be more efficient. If it only goes infrequently this thing wins. I guess in that regard this really is really between a bus and a train.