An automatic transmission works differently from the manual transmission. Here, the gears change automatically according to the acceleration. You won't see the difference in the top speed of the car, but the response time increases in the automatic variant. In simple terms, the time taken to reach at a speed of 100 km/h is more in the automatic variant. For a brief on the performance of the car, follow the link of the first-drive review - Review. Moreover, you can have a test drive of the car for a better idea, by visiting the nearest dealer in your city. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Dealers.
