Agreed--- bids are not guaranteed.
Sophomores are at a greater disadvantage than freshmen at some chapters, but not all chapters.
Not all chapters get a lot of recs, but many do and they are coming in increasing numbers each year. When I was in school, we got a lot at my chapter. I can't speak for the others.
It's cliche, but keep an open mind to every single chapter, just as you would want each chapter to give you a fair shake! Each chapter is between 80-150 members. If you can't find friends in a group that size, I think the problem does not lie with the sorority!

LOL.
The UCF Greek System is going to be a fantastic experience, no matter what chapter you call home. More than 10 years after joining, I still love ADPi, but I know I would have been proud to call any of the UCF sororities my home! I was in a wedding last weekend where the bride was a UCF Chi-O, and her attendants included ADPi's, a Tri-Delta, a KD and other Chi-O's

It's a wonderful Greek community, and you're going to have a great time at recruitment!