I have friends with kids at both campuses and from what I have heard there is not much difference between the two. The qualification of teachers, the ethos and approach to education is the same across both campuses. Dover campus has just been around longer, so people tend to assume it has a better reputation, but when compared -- they are on equal footing.
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I can't speak for younger kids but I know parents with kids aged 15+ who have loved UWC Dover and particularly chose it because of the IB curriculum. Never heard anything bad other than the price!