[fendy3002]

Depends on situation and conditions. In this UX case, assuming that information is ready, a team of 10 UX experts with similar expertise and have been working together for some time will reach the good decision.

A team consist of CEOs, managers, devs, UX, marketing/sales & finance won't get the same level of decision assuming the information is ready. However they'll be useful for information / idea gathering / brainstorming when the information is not ready, for a single person / team to make decision.

My past experience sums up to this:

* Team of similar expertise & knowledge: good & fast on decision making, lack on seeking knowledge in other part of expertise

* Team with variety of expertise & knowledge: will make slow & bad decisions more than good or fast one, in exchange of decent chance of knowledge sharing for each expertise

Of course the quality of each member, how can they work as a team, whether they have hidden personal agenda / hating each other plays part in the quality and speed of decision making too