I would suggest go for it if resale isn't a concern. I have a City which was bought new in 2014 and now a Ciaz for almost a year. Ciaz is better family car in all honesty. Comfier, softer suspension, seats, comes with decent Bridgestone tyres. Features wise, nothing extraordinary, but better than the city in some small things.
I have nothing against the city. As a matter of fact the City is my daily work horse and still running strong with 160k on the ODO. But so far the Ciaz has not disappointed at all. Take care of it and it should serve you well like any other car.