My money's on Brazil or Israel, they put out robots that are a bit more classy (aesthetically speaking) than your average humdrum U.S.-ian robot
. They have some unique advantages and disadvantages though:
1) Brazil builds during what I believe is their main vacation from school... (if I recall correctly)
2) They get their KOP much later
3) In Israel students need to have a "senior project" of sorts, and for most FIRST student's, the robot is that project and they can dedicate a lot of effort to it.