Postpaid network

Really depends on;
1) location - where you are using it? Some area are good with one operator but not with another. Whether it's maxis or Digi or umobile or celcom. You need to test it out with a prepaid  plan going into any postpaid package.
2) cost - maxis has highest cost packages and very high roaming costs. If your phone plan is automatically paid for and your staff doesn't dare query you on why your bill is so high then maxis is the way to go. On the other end is umobile, providing cheapest and meanest plan. In between is Digi and celcom.
3) service quality - maxis used to be good until they decided to cut down on their costs significantly. So I guess now they are about the same as Digi but significantly higher cost. Celcom have bet