Okay. Lets start with its engine.
On advertisement, they said its a 1.4L K-series engine but in actual its a little less than that (1373cc as i remember). I will check it's documents again and comfirm.
The power generated by this engine is okay. Its better than city's 1.3L variant (for obvious) but much more like swifts 1.3L which is also more than 1300cc (1345cc i guess). I never drove a 1.5L City or 1.3L Gli/Xli so i can't compare it with those cars.
Talking about the engine room, very spacious and it has a bonnet shield (i don't know the exact name of that thing) which helps in reducing the engine noise. That shield is not installed in Honda City, so thats a plus point for Ciaz over City but its available in all corolla variants.
Overall comparison score:
City: 0
Ciaz: 1
Corolla: 0.5 (for bonnet shield)