All the co-op courses are fairly competitive. They're all good programs. So just apply for the ones that you are interested in.
Co-ops are required to maintain a credit average. Finance requires a distinction average due to the honours component of their program.
So during your IT, will they ever get you to come in on weekends or do overtime? And, do the sponsors expect a lot from you? I've heard of Co-ops making extraordinary achievements during their IT.