As someone who has been spending way too much in the back of our jets and have flown both the 73 and the bus the bus is just a bit more roomy. Wider and taller cabin, window seats feel slightly less cramped on the bus, overhead bin space is significantly better on the 321. The 737 airflow on the ground is terrible. The cabin gets pretty warm as soon as we get on the ground compared to the bus. The gaspers are useless. I don’t think the average passenger will notice as much as we do.