So I went to drop-in-advising at UC Berkeley Haas (I went to Berkeley undergrad), and an admissions counselor explicitly told me Haas' MBA program prefers the GMAT to the GRE, although they do accept the GRE for some candidates. In their view, they feel the GMAT is more reflective of b-school success, particularly with the quant portion.
Does anyone know if this is true of any other t16 school? I'm not sure, but I heard UCLA Anderson also prefers GMAT over GRE. Most other schools say they weigh the GRE and GMAT equally on their websites, but there could be more that meets the eye.
I'm personally planning to take the GRE over the GMAT, so I'm looking at schools to rule out, like Haas.