I think its important to note that for asset management neither of these schools place very well. IB is a different story with Yale placing 15% and Cornell placing 13%.
Ignoring placement for AM aside, I think as mentioned both these are very comparable schools with similar employment statistics - and you really can't go wrong with either. The choice boils down to personal choices. I was admitted to Yale and to Cornell with $$ - and I chose to enroll at Yale. I can share my own thought process for choosing Yale, but I realize that this will be different for everyone.
I think one key difference is location. @ Yale you are an hour train ride away from NYC - whereas in Cornell you are in the middle of nowhere. This maybe somewhat of a difference to you if you are trying to place in NYC, making recruiting trips a bit easier. Secondly, whereas I think at the present these two are peer schools, my personal opinion is that Yale has more of an upside in the long run.
One key change is the new campus - and while many may say that its simply a new building, I think it will certainly have an impact on rankings, given that some key rankings are based on student feedback. Secondly, I think Snyder is making some much need changes at Yale - doubling scholarship funding by 2015 to $6.5M from $3M, etc. The enrollment in the MBA program is also set to increase from 450 to 600 students, and I think this gives it the necessary critical mass to attract more recruiters. All in all, I think there are numerous changes ongoing at SOM, and I think its an exciting time to be a part of it. I certainly felt this buzz from the students when I visited.
Either way, congrats on the admits! These are both fine schools, you can't go wrong either way.