Time for Welton's Law of Advice: for every bit of trite advice, there's an equal, and opposite bit of trite advice :-)
Although in this case, what it really comes down to is what you hope to achieve. Some side projects are good as an outlet for creativity where you don't have any deadlines or things you want to accomplish or anything else. Others are more focused. The important thing is to be clear about what you want.
Although in this case, what it really comes down to is what you hope to achieve. Some side projects are good as an outlet for creativity where you don't have any deadlines or things you want to accomplish or anything else. Others are more focused. The important thing is to be clear about what you want.