I have an Alto AGS, yet I am saying this. If you are getting a car with company incentives, then get a Picanto due to its comfort, build quality, safety, smooth gear shifts, fewer rattles, and better soundproofing. I have done many things to my Alto, including 3M tinting, Japanese leather seats with extra padding, a multimedia and subwoofer system, etc., but I can't get over the engine noise and cabin noise. On smoother roads it's much better, but comfort generally is weak. I have a Revo as well, and it's even more comfortable and super quiet, but let's not compare apples and oranges.
When fuel average is not a concern, there is no reason to get an Alto.
By the way, Alto is the fuel average king. I have never averaged below 20 on the meter, and currently mine is at 24 on the meter and super cheap on fuel. Planning to upgrade but i know that those cars wont be as feul effivient and thats a fact.