Any opinions in terms of which one is better, regardless of location?

CHOP! No doubt! ;)

Although I can offer no real insight as to the program itself, I can say that the physicians, residents, and support staff at Children's Hospital of Philadelphia (CHOP) are amazing people. No wonder it's top (3?) (5?)...up there...in the country.

CHOP

of course, if you want bigger........everything's bigger in Texas http://www.texaschildrenshospital.org/allabout/default.aspx ;)