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It also depends on your class rank. If you are a Freshman, you can also attend COR in the fall, but not all chapters participate. If you are a Sophomore and you really want to be in a sorority, you might not have a "next time". If you are a Junior, you won't have a "next time".
I attended 3 chapters for Pref. I would have been happy with my first or second choice but probably not my third. My #3 was actually considered a slightly "better" chapter than #1 or #2 but I didn't really like the girls that much. If I had received #3, I would have tried it to see if I clicked so I can't say for sure that I would have dropped.

Reality is this is your best chance to join a sorority-you probably won't do better next year. Fewer sororities do COR. Most girls have disappointments during rush, it is the way it is. With 125+ girls in just about every sorority, you are bound to find girls that you click with, and girls you don't. No sense bumming over sororities that cut you, look at the ones you go to at pref with fresh eyes-can you see yourself with them? How much do you want to be in a sorority? Are you a glass half full or a glass half empty kind of person? Good luck!