Freelancer or Salaried

Hi,

I am working as an independent contractor for a client, as a freelancer not of an employee; however I work for only one client, the payments are received on almost the same date every month. The services that need to be performed are decided by the client. There have no allowances and perks except the monthly payout. 

While filing ITR, should form 1 be used (income from salary) or form 4 (income from profession with 44ADA)?

Thanks in advance.