To pick one over the other, Collegiate without a doubt!
I'm assuming they are both used, older saddles that you're looking at since I don't think Cortina even exists anymore! Cortina's were pretty cheap, crummy Argentine saddles. Older Collegiates were distributed by Miller's (same company that made Crosby's at the time). They had great balance and medium-quality materials. Pretty sure they were also made in Argentina. Collegiate has made a good name for itself in mid-range saddlery.
Of course, I supposed I must add........whatever fits your horse and your bum the best is the best saddle to choose!
Monte - 15 year old Paint/TB
Auric - 13 year old Arab