Basically, both the vehicles are amazing vehicles but Honda Brio S MT has a slight edge over Hyundai Grand i10 Magna in terms of power, mileage and performance. To draw a detailed comparison between these hatchbacks, kindly visit the below link: -
That's great if you are planning for a new car. It might interest you to know that Hyundai is planning to launch the facelift version of the Grand i10 sometime this year around August/September. The Grand i10 facelift is also likely to get AMT (Automated Manual Transmission). So if you are planning in 1-2 months, we suggest you to wait for its new facelift version and other new upcoming cars.