OPC is best for single entrepreneurs, However there are some limitations such as
NRI or foreigners cannot be part of OPC. Unlike in Private limited company which allows Foreigner to become director of the private limited company.
OPC must be mandatorily converted into private limited company if its annual turnover exceeds Rs. 2 crores or the paid up capital of one Person Company exceeds 50Lakhs.
Also in certain licenses only pvt limited are allowed to take.