I had a chance to actually feel and experience the Ciaz at dealer launch. Though I was expecting a lot as I wanted to buy a City, I was pleasantly surprised by the quality Ciaz presented. The plastic quality is better than its competitors, its sturdy (just feel the rear air-con vents), the doors are large..HUGE and feel heavy, the dash is much more premium looking than shown in images. There is lot of space, a tall person will only go for this car in the segment. The car looks large from outside and alloys add to looks.
I was sold on the car and have confirm my ZXi (AT) booking with dealer. Came home smiling, so much that I lost the way and made a additional 5 km round. I was trying to buy a C segment car to upgrade my sweet hatch and I think my search ended here. Premium, spacious, features and nice pricing (I hoped AT would have priced 20K less though).
I suggest, before making any comparisons, just sit in the car once. I am sure Maruti will not disappoint me when I have TD in couple of days. I think the selection will be based on what you want: if you want a large family car from reputed brand with lot of premium features your family can enjoy, space (front, rear, boot), FE you will like this car.