Most people in Singapore today prefer installing door lever handles. These door handles are very helpful when you have to get through the door. You will not need to turn the knob to unlock the door. Just by applying a small downward pressure, then the door will unlock.
Additionally, if you have dirty hands, you just need to push down the handle using your elbow to open the door. Aside from the benefits of installing a door knob, there are also benefits in installing door lever handles.