If you are planning to buy City, better go with 1.5. With that engine, it's the fastest sedan in this segment.
It's better to buy Proton Saga instead of this 1.2 city because with those specs, I don't consider it as a B-Segment sedan. Protno Saga has better hp, torque and power to weight ratio. Saga's weight is 1055 kg for manual variant which makes it 64.4 watt/kg. 0-100 of manual is 12.1 sec and auto is 13.1 sec. The only thing you need to bear is old style interior, which is not a dealbreaker for me for the price they are selling.
Just to give you some insight about power to weight ratios of different vehicles that I calculated during my research for buying a new vehicle. All numbers are in watt per kg.
B-Segment
Honda City 1.5l CVT - 75.5
Alsvin 1.5 DCT - 72
Toyota Yaris 1.5l CVT - 71.2
Alsvin 1.37 MT - 70.48
A-Segment
Proton Saga MT - 64.4
Cultus - 62.9
Wagon R VXR - 60.6
Alto VXL - 43.3
Alsvin has better power to weight ratio than Yaris for both 1.3 and 1.5 variants. Upcoming City 1.5 is the fastest.