If you plan to raise funds from investors, then you will need to have a private limited company. That is because angel investors or VCs will have to be given equity i.e. shares in the company.
In a partnership, the partners ‘share’ determines the ratio of profit sharing between partners. However, angel investors and VCs do not invest to get returns through increase in valuation of the company i.e. so that they can sell their portion of the equity to another investor, company or, if the company goes IPO, then on the stock market.