The best area depends on your daily routine more than a general ranking. Start by thinking about where you work, study, meet family or use transport most often.
Gulshan-e-Iqbal
RoomRentPK lists several Gulshan-e-Iqbal references, including Aladin Park Block 10-A, Block 5, Block 3, Disco Bakery and 13-D. If you are considering Gulshan, compare travel time to the places you visit every day.
DHA side
DHA may be practical for someone whose work or regular activities are already on that side of Karachi. RoomRentPK includes a dedicated DHA / PNS room collection, but exact current room locations should still be confirmed.
Clifton side
RoomRentPK includes Clifton Do Talwaar in its service-area references and has a dedicated Clifton room collection. As with any area, check commute time, transport options and the exact room surroundings before deciding.
Make the choice around your routine
A room that saves daily travel time can be more practical than one that simply looks better in photos. Ask RoomRentPK what is currently available in your preferred side of the city, then compare the specific options.