Development Preference

[Darkfire]

A big upside of solo design is total power over the creation process. A big downside is lack of outside encouragement to work.

Havn't experienced it myself, but probably working in a team creates such problems as disagreements over creative choices, scheduling issues and having arguments on the quality of one's work.
On the other hand you have someone to help you solve and do things when you have run out of ideas. And in a team anyone who doesn't feel like working can be encouraged by others.