I'm in the currently midwifery class, we have 14 admitted students in the cohort. Our total ETP class size this year is 145 students. The 190 students you are referring to is from 2 years ago. That was an abnormally large class size and apparently administration will never do that again?. Administration said 190 was just way too many people. It created chaos.
I'd say midwifery and anesthesia are the two most competitive programs at the school because they don't accept as many students. These specialties also don't allow student's to change into them either. That said, you can change your speciality within the others though...FNP, ANP, ACNP, PNP, WHNP etc etc.
I'd say the only difference in those two specialities is that most students are 100% sure this is what they want to do. They've either been working in a field that goes hand in hand or have correlating volunteer experience. Most the anesthesia students I know were chem majors or hard science majors. The midwifery students are mostly doulas or have a background in women's health related services. That said, we do have two straight from undergrad who just seem to be really passionate about birth and empowering women.
Good luck, I hope this helps!