oh and offcourse the queen b will do well in the states
overseas will depend on their sound. i think where as US different music can be a hit i feel most of the euro markets go for techno predictable sounds that you can pretty much get if you're trying. because both these girls take risks they are likely not to do that sound and therefore their success overseas may not be as good as the US
britney will make a full on comeback. prob better overseas. she looks more like the market so offcourse she has more appeal