Originally Posted by cadetdrivr

It's virtually identical.

Junior ORD 737 F/O: 12,406
Junior ORD 320 F/O: 12,363

(Junior pilot at the company: 12,637)

That said, this info is pretty worthless to determine the "quicker" airplane to get to ORD. It's all up to the manpower planning folks and pilot movement to determine which airplane has more vacancies in the the next 6-12 months.