it all started in the bronx but the foundation of hip hop came up outta queens wit artists like run dmc, ed lover, kool g rap, q-tip (tribe called quest) and ll cool j. some people might say in later years because of big names outta brooklyn like biggie, jay z, and pac that brooklyin is the most successful but look at how solid queens is still today... nas, 50 cent, mobb deep, noreaga, cormega along with a few ogs that are still making records. so i would have to say queens. however im suprised that long island didnt appear on ur list. they attributed a lot to the culture wit rappers like chuck d from public enemy, busta rhymes, flava flav, de la soul, epmd- to name a few big ones.