For Social Sciences at KCL they ask for AAB (one grade below your prediction), which is what their accepted students typically get. For Global Development at QMUL they ask for ABB (two grades below your prediction) but their accepted students typically get BBB. (Same sources as above.)
As you exceed the entry requirements for both, I'd have expected you to receive an offer from both (assuming your personal statement and reference are OK, and there are no issues with your A level subjects or GCSE grades). However, given the lower entry threshold and flexibility on achieved grades for Global Development at QMUL, then I'd say you're more likely to get an offer there.