Another distinctive difference was the speakers. Growing up in the org., Young black brothers are expected to give GREAT talks. I gave a GREAT talk (IMO) and recieved 7 minutes of counsil for having my legs too far apart. I was JUST 16, but very arrogant. I think the black halls are TOUGH on all speakers. They EXPECT GREAT talks ALL the time. In white halls, it was very rare to get an IMPACTFUL motivating speaker. I actually scheduled / requested brothers from my hall in South LA to visit all of my white congregations. Ironically, many of the Black brothers in white congregations were below average speakers.
This is JUST my personal experience / observations.