Take the 320 , all the growth is there. I got some pals who got in board last march and are still reserve and will be for some time on the 190 due to no growth on the 190 , sure it will change as guys jump from the 190 to the bus after their 2 year seat lock, but either way growth is on the bus period ... Plus once you do hold a line there is far more bus flying to choose from when it comes to swapping trips in open time and trade with etc, a junior line holder on the bus will get many red eye crappy trips and the only way to get out of then is swapping stuff around ... Easier done when there are trips to do it with .