Which organizational structure type do you feel will benefit large projects? and how?

Small organizational structure collaboration by other organizations who have expertise to support based on our need or condition , that's is the most benefit for making large project The structure must be like a team with one leader, all of the member will make committed together of every single decision, so every decision will be more values, the best structure is flat with one leader on the top, because our age today is different with those who live- years ago.. We change very fast and information was over loaded for some individuals, and we can collaborate so fast in seconds, this is the age for collaboration