Conversations

My own: http://scratch.mit.edu/projects/23245504/
Penguin Remix: http://scratch.mit.edu/projects/23247339/

I would describe Broadcast as a more simplified way to create conversations if the conversation is a bit longer than usual. Broadcast is a great way to have Sprites immediately reply to one another using one command block.

I would use timing when it is required to create a shorter conversation, maybe with only one or two replies, or when there is only one character saying something. I would use broadcasting between two characters, or when the conversation is lengthier.