Which 125 cc bike is the best

Hi, with out any doubt go for the reliable Suzuki Sling Shot Plus. The bike has reliable 124 cc, Air-cooled, 4-stroke, single cylinder, SOHC, CDi engine with 8.5 hp @ 7500 rpm of power and has 10 Nm @ 3500 rpm of torque. The bike has mileage of around 54 to 64 kmpl depending upon the riding conditions and style.
Bajaj bikes lacks engine reliability and has shorter life span and are not consistent performance bikes. In my personal opinion its better to go for Honda Shine which is the best 125cc bike in India with more reliable engine, more power and quality body parts and has good comfort in riding and handling and has good resale value. So first test ride both the bikes and take a wise decision.

Avoid Bajaj bikes as they lack durability and quality. Suzuki is better. But if you want to buy an even better 125cc bike, then go for the Honda Shine, which is much better that Bajaj or Suzuki bikes.