JBW is supported by almost every relevant study and data set one can think of, as well easily observable almost everywhere. Even Africa.
JBB is debunked by almost every relevant study and data set one can think of, and the best support for it is cherry picking, anecdotes and whitecels desperately wanting to cope with a scapegoat.
I've always thought the best option of ascension for a blackcel would be to aim for a middle class black becky/stacy. From what I can see it relies heavily on moneymaxxing.
Expatting to a different country as a blackcel (or any dark skinned ethnic really) is a waste of time.