One partner can be sued for the actions of another partner. A corporation would give you some protection from this risk. As always, insurance can give you additional protection. When banks, suppliers and others lend your business money, they want security to assure that they will be paid back. Small businesses often lack that type of security, so the owners are required to provide it by guaranteeing the loan.
Guarantees override the shareholder protection normally afforded by a corporation.
Your business may have sufficient assets to secure any loans you might need. If this is not your situation, forming a corporation would do little for you on this point. If all of the co-owners of your business are active in decision making, the need for the centralized management structure of a corporation may not be particularly necessary. It really comes down to a matter of personal preference and how you all interact. As shareholders, they will participate in electing the board of directors who will be responsible for management.