Which is better Volkswagen Vento 2015-2019 petrol or Volkswagen Vento 2015-2019 diesel?

This depends on the daily commute that you plan to do in your car. If your daiuly travel is less than 50 kilometers than it is more sensible to go for petrol variant of Volkswagen Vento while if your commute is more than 50 kilometer daily you should opt for the diesel variant.