Kartikeya Singhee and Ameya Dandekar bring together 4 hatchbacks, the Maruti Celerio with the AMT Gearbox, the Nissan Micra with CVT , the Honda Brio with the Planetary Gearbox and the Volkswagen Polo with its Dual Clutch Transmission (DSG)  to evaluate the pros and cons of these different automatic transmissions