I'll just pipe in and say if you want to use your testing to advocate with the school, it would be wise to check and see which test the school will accept. They may be very particular or not at all.
I'm not sure if the WISC-IV is better or worse for globally gifted kids or if the SB is better for globally gifted.
DD8 had high scores evenly on the WISC, thus I've inferred that she is globally intelligent.
Not sure how she would test on the SB.