I have received an interview at one of my top choices - but it was after the initial invites were sent out. Is there any bias with regards to selection/matching or is everyone pretty much on a level playing field once they have an interview?
I have some knowledge about the selection process (at one program). I'd go to your top choice interview. Honestly, there are more qualified candidates than interview spots. Programs just go down the list as candidates cancel interviews.
As long as you are not an outlier (grades/scores), you are pretty much on a equal playing field during interviews. Some MD/PHDS with 10 publications or Olympians may create some pre-interview bias. But, numbers/grades/recs tend to blur when you interview 10-30 students a day. Therefore, much of my ranking was based on the interviews - grades/letters/numbers were used as a tie breaker.
What I looked for:
1. Will this person complete the program? Do they have a true desire to pursue this field?
2. Will this person work well with the faculty? Can I work with this person for three years? Would it be enjoyable?
3. Does this person fit in with the culture of the program?
4. Is he/she a team player? How would they work with their peers/fellow residents?
5. What makes this person unique? Something besides medicine. Hobbies, etc.
A great interview can change your ranking tremendously. Likewise, a poor interview will sink you. No brainer, right? But, I think some candidates underestimate the importance of the interview. You can have a 260, AOA, 8 pubs, honors in all your classes, but if you present yourself poorly, you are done.
The 10-15 minute interview is not scientific, but intuitive. Good interviewees (and poor interviewees) will stand out from the rest. Have a great interview and your interviewer will go to bat for you come ranking time.
I cannot speculate on other programs, so please take my advice with some hesitation. Good luck.