Do American colleges “favor” either the IB or the AP?
No – colleges realize that students normally attend a high school offering one program or the other and that a good score on either exam is a likely indicator of success in college. However, prior to the 1990’s the IB was relatively rare in US public schools, so some smaller US colleges may not be as familiar with it as they are with the AP. This issue has largely disappeared among competitive universities and is diminishing rapidly nationwide now that more and more high schools offer the IB. Most universities publish their recognition policies on their websites.