As a person who has been black elsewhere and black in America, the biggest advantage of being foreign born black person is having grown up in an environment where black excellence is not exceptional, it just expected.
In the US, inferiority of blackness is so deeply ingrained and entrenched. it's like air, we (blacks, white and everything in between) have all breathed in and fully internalized that we don't even realize its there.
That rings true to me. I couldn't see it until I'd moved to Argentina for a few years, which is also very racist but in a way sufficiently different that I could see the absurdity of the US system of racism from the outside. Dangerous as this is, recognizing my own blindness to my own subconscious racism makes me totally disregard the opinions of people who have lived in the US all their lives on this matter, because I know that 95% of them are looking at the world through the same lens of subconscious prejudice I was, because they've never seen anything different.
Reading things like The Color Purple, Black Like Me, and The Autobiography of Malcolm X in my childhood didn't remove that blind spot; if anything, the contrast tempted me to think that racism was pretty much a solved problem in the US, except for a few reactionaries. It wasn't until years of living something fundamentally different that I could start to notice how absurd and pervasive it was.