To go with a car is totally depends on your personal preference and requirements. If you drive less than 1500 km a month (50kms a day), you don’t need a diesel. The petrol engine is a lot more refined and is a lot more quiet and powerful. Yes, the diesel is more efficient, but it doesn’t mean it is cheaper to have a diesel engine unless you have a lot of running. Diesel is cheaper to run. But diesel cars are more expensive. If you do not have too much running, petrol makes it an ideal pick. For more, follow the below link - Fuel type. As far as the transmission is concerned, if you are looking for a comfortable car for city commutes and like calm driving, you may opt for automatic transmission version. On the other hand, if you want a better command of the vehicle and want like quick driving you can opt for a manual transmission.