That's a bold statement! It's really difficult to dethrone the mighty Honda City, as Honda badge is looked as more premium than Maruti. Also young buyers may still prefer City due to more sportier design than the safe (but beautiful) Ciaz design.
But if you ask me to choose personally, yes I will choose Ciaz because I get almost everything that City has, plus the attractive alloys and projector lamps. Also in India (at least) Maruti commands more value in aftermarket (once you decide to sell) than other brands due to obvious reasons. Secondly, I save a good 1 lakh with Ciaz which I can use to tune (ECU remap/tuning Box) the engine as per my choice (costs max 25k), and to add other accessories in future. This DDIS is upgrade friendly as we have seen already and this increases power to anywhere between 120 to 130 BHP which is more than sufficient I believe
BTW, the ICE HU in V + and Z (O) is looking more premium than that 7' touch screen. Am I the only one to think so?