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While group brainstorming is often more effective at generating ideas than normal group problem-solving, study after study has shown that when individuals brainstorm on their own, they come up with more ideas (and often better quality ideas) than groups of people who brainstorm together. 

Partly this occurs because, in groups, people aren’t always strict in following the rules of brainstorming, and bad group behaviors creep in. Mostly, though, this occurs because people are paying so much attention to other people’s ideas that they're not generating ideas of their own – or they're forgetting these ideas while they wait for their turn to speak. This is called "blocking". 

When you brainstorm on your own, you'll tend to produce a wider range of ideas than with group brainstorming – you do not have to worry about other people's egos or opinions, and can therefore be more freely creative. For example, you might find that an idea you’d be hesitant to bring up in a group session develops into something quite special when you explore it with individual brainstorming. Nor do you have to wait for others to stop speaking before you contribute your own ideas.

You may not, however, develop ideas as fully when you brainstorm on your own, as you do not have the wider experience of other members of a group to help you.