What advantages do Jack and Sarah have starting iUser Accessories together, rather than one of them starting

Question:

What advantages do Jack and Sarah have starting iUser Accessories together, rather than one of them starting it as a sole entrepreneur? What challenges do you think Jack and Sarah will have keeping their together?
Partnership
A legal form of business operation between two or more individuals who share management and profits. A Written agreement between two or more individuals who join as partners to form and carry on a for-profit business. Among other things, it states...