I prefer design part individually but analyses in the group.
Even though i like to work individually i always ask advise and opinion
from the other people, therefor i thinks it is needed to have group of people always around you. it is real good to discuss your thoughts with-someone, who can give you completely new perspective to look at. some questions or things that you did not pay attention so much can come up as a big problem for some people.
So both-wise communication is really important and needed!