@HappyAlumnus : I would beg to differ on the quality of grandes ecoles. It is clear from the previous discussion here why the grandes ecoles and prepa are top in math/physics (10 fields medalists, 15 nobel prizes, etc at ENS for example).
As PurpleTitan notes this is subjective anyways.
@alcibiade : Would you mind elaborating on what sort of “crises” your daughter had at Cambridge? I ask because initially my parents were worried about me going to Cambridge because it’s far away from the U.S and I wouldn’t have a “support network”. We agreed this would be a nonissue since I have family in Normandy and Paris only 4 hours away, and my parents are moving to France in 2 years most likely.