This depends on how you want to use your charger. If you want to just plug in your car to the charger and let it charge the car up each time (like putting a plug into a wall socket) a smart charger is not required. However, you will need a smart charger if you want to use your charger to do more things; like charging the car at cheap electricity times, schedule charging to provide a full charge by a certain time, or even integrating your solar PV system to the car to provide free electricity to the car. To future proof your car charging and for more flexibility we usually recommend you buy a smart charger. In the near future, you may even be able to get paid for providing electricity to the grid from your car battery (assuming you buy a charger that can do this).