Is there someone with numbers ready?

What is faster in the means of bandwidth: long-handed inserter with two containers (say chests) and full stack bonus, or yellow/red/blue belt of equivalent length (chest + long-handed + chest)?
Just thinking about replacing the main bus with inserters

BTW, if some assembler needs four types of the input, and there are all four types in the chest, can an inserter take all four materials in one swing?