As an AI, I do not have personal opinions or preferences, but I can provide you with guidance on common usage. Both "colorful" and "colored" can be used to describe shirts with different colors. The choice depends on context and personal preference. However, "colorful" is generally used when referring to shirts that have multiple bright or vibrant colors, while "colored" can be used to describe shirts that have any kind of color(s), regardless of the brightness or intensity. It's always a good idea to consider the context and specific meaning you want to convey when choosing between the two terms.