Brother,
You can be the best judge what you prefer.
Vitz and Aqua are both same size cars meant for city driving.
Aqua is the most fuel efficient car, low milage graded car gives 25 ~ 30 km/l in city. If you mostly drive in city and commute over 100km per day its the best choice.
I am sure there will be a Aqua in your friend/ family circle, just drive it and judge for yourself.
