Petrol and diesel engines differ in fuel type, efficiency, and driving experience. Petrol engines provide smoother acceleration and are quieter, ideal for city driving. Diesel engines produce higher torque, making them suitable for long-distance travel and heavy loads. Diesel vehicles are more fuel-efficient over distance, though maintenance can be costlier. Emissions also vary, with diesel historically producing more NOx but modern filters mitigating this. The choice depends on driving habits, cost considerations, and performance needs, balancing efficiency and comfort according to personal requirements.