The Harley Davidson Fat Boy is a better bike than Fat Bob. The basic reason comes out to be the engine, which the Fat Boy uses a 1690 cc, 132 NM @ 3500 rpm whereas the Fat Bob uses 1585 cc, 126 NM @ 3500 rpm. The Fat Boy returns a mileage of 13.99 kmpl and uses wider tyres than the other in the competition. Both the bikes use same size of fuel tank and many of the components are same. The Fat Boy comes with a price tag of INR 15,08,500 whereas the Fat Bob comes with a price of INR 13,03,500. Being 11 kg heavier than the Fat Bob, the Fat Boy is the ultimate choice for cruiser bikes.