A carburetor vehicle will be more pocket friendly in terms of maintenance, sure it will not be as fuel efficient as efi but it also doesn't have a computer. I practically had my alto submerged till the bonnet under water and it still did not stop. It turned off at a pump nearby and after a short wait started up again.
Not only this, practically each and every part is very cheap, interior handles break very frequently so keep 2 handles as a spare (Rs 150/ handle) and learn to fix it yourself. The fewer the components the less likelihood that the car can breakdown and even if it does its easier to repair. Either go for an Alto or a Coure, neither will Liana be a suitable choice or Santro or any other vehicle that is old or has an efi system that will make you spend a lot to repair.