Based on the following grounds the public and private company differ that is, a company that is listed on a recognized stock exchange and traded publicly, and a private company is not listed but handled privately by the members. So now talking about the advantages of both:
In public company cash infusion, there is an immediate cash infusion in a company for a specific purpose. It ha access to public market for funds but sometimes cheap for raising capital. But some disadvantages are: We don’t know which public investor own their stock and financial results are never disclosed.
In private company advantages are that everyone has a say who the investors are and no requirements for disclosure. But disadvantages are have to search for a an investor to raise a capital and that goes more costly.
So public might have positive side only if advantages are balanced to its disadvantages, as public drastically changes the operation that can affect on going projects and business.