I always use crab and kick for these reasons:
Problems associated with a sideslip landing:
1. Airspeed indicator not aligned into the oncoming airflow. It is offset to the wind and a true representation of airspeed will not be reflected on the ASI leading to an underreading of approach speed which leads to a higher approach speed to the landing threshold.
2. When the aircraft is aligned with the landing runway, then the fueselage will cut out some of the airflow and thus will create extra drag because now aircraft is going sideways through the air pushing the main body of the aircraft through it. Due to the aircraft going sideways through the air, the downwind wing will now experience less airflow due to the blanketing of air from sideslipping which will in turn decrease lift.
3. Constant corrections are needed all the way down finals as in general, wind speed will decrease as the aircraft nears the ground due to surface friction and obstructions. This requires constant corrections.
4. More power will be needed because more drag is being experienced and therefore more power will have to be bleeded off during the final touchdown. This extra power reduction will have an effect on the slipstream properties from the propeller and therefore the amount of extra correction required from the pilot.
5. Uncomfortable for passengers