An LLC protects your own personal assets in case your company is sued. However, the legal structure is more complicated than Sole Proprietorship.
In an SP, you have less restrictions on reporting, etc, but you are not protected. If someone sues you, you could lose everything - house, car, business, even your furniture.
Since you are doing this for a homework exercise, and the liability part is not being considered, I would say the more flexible structure is the SP.