Just as Mindy is biased to her institution, I am biased towards mine (BWH). While we will only have about 62 to 63K cases this year, I feel it is more than enough.
Traditionally, BWH has been seen as a refuge for PhD's on their way back to the lab. I don't believe that this still holds true. The staff at Brigham is top notch (i.e. Who here hasn't written a textbook?). There are certainly countless research opportunities, but you make the choice to pursue those opportunities
Our system is very different than MGH. The first two years are straight surgical pathology. While a couple of services are subspecialized (Gyn, Neuropath, Medical kidney), everything else rolls through a general bench. Thus you see breast, colon, thyroid, mesothelioma, dedif liposarc, every time you are on surgical service.
One nice thing about the Brigham system is flexibility. You work like a dog for the first two years, you learn a ton of surgical pathology, and then you choose your own adventure. You want to go straight into CP, great. You want to do a surgical pathology rotating fellowship, great. You want to go to a lab for a post-doc, great. The choice is yours.
Ultimately, the biggest factor for me was the people. There is great camaraderie amongst the residents and between the residents and staff. My class is an amazing. Overall, a diverse group of people and surprisingly not everyone is PhD.
I hope this helps.
P.S. A small jab: The MGHers come over here to do their cytogenetics rotation.
P.P.S. Soon the two hospitals will be closer than ever: MGH and BWH will be sharing the same pathology information system.