Urgent Advise: cooperative housing society vs private housing Karachi

Hi,
I am planning to buy a property at cooperative housing society in Karachi . I need advise

  1. What is the difference buying a property at cooperative housing society in Karachi Vs buying in open private areas such as Gulshan e Iqbal, gulistan e jauhar and other?
  2. What are the advantage and disadvantages between cooperative housing society vs private /public residential areas ?