I would not port my Warid number to any operator.. As the network is gr8 , call quality and Warid's EDGE speed is acceptable as well.. ofcourse 3G/4GLTE is a plus with any operator but if EDGE and 4GLTE services are good with Warid then I will stick to Warid (Tariff matters too ) .. otherwise my next option will be ZONG as they are 3G equipped and 4GLTE also .. Their coverage is amazing in RWP/ISB (Indoor too)
Tariff is also good 
Just waiting for Warid to Launch 4GLTE and i will see their coverage and tariff .. My final decision will be then 