Anonymous wrote:There is not enough of a difference between Maret and WIS academically (and any difference there is has more to do with the HS not the LS) to go against your husband's very reasonable desire to have his child be immersed and fluent in his language and culture. And the schools are more similar than different-very small, located very close to each other (at least Maret and WIS MS/US), favorites of the international set in DC (not just WIS, also Maret). If your child is an excellent student, and finds WIS too small or not academically challenging enough by HS, then can apply out then for another school (and by then if still love Maret, I suspect they won't hold your decision against you given your family language situation).
Too small might be a consideration (I don't know the size comparison between WIS and Maret), but there are few students who would find that the IB diploma program at WIS isn't "challenging enough." We do know several students at WIS who applied out for high school, which is common at all schools if only to get practice with the application process they'll be engaging in for college (tests, essays, interviews). They seemed to have zero trouble getting in to other top NW private schools. A few left, maybe looking for bigger schools, but most chose to stay for the IB diploma program.
PP is probably right that Maret is more racially diverse (in the U.S. sense) in high school. WIS, of course, is more diverse in national origin.
Good luck deciding if your child got into both! That's a nice choice to have.