l am a middle class person .l want a car which l could use for 10 years or more.For four to five person.Duo has advntage that it can be used on LPG when on Long drive and it will save money.normally also now and then l can use it on LPG to save fuel .

Do go for the Duo. It is value for money, has neat boot space and the factory fitted LPG saves you a lot of hassle.

Wagon R is better, cheap and best, low maintanence, spacious enough, LPG compatible.

Zen Estelo is the modified version of zen & after the original zen the company has be trying to come up with new shapes but all the efforts to revive the magic of original zen has been going waste. Estelo looks more of a toy car & l do not think it has much of leg room though l have not inspected the car personally, between the two Duo is a better option as it has got a company fitted LPG toroidal tank which fits well into the sunken spare wheel space. The car always starts on petrol & then switches to LPG that means no much of pick-up loss, LPG is conveniently availably at pumps, it is safe & its a liquid fuel so nothing to worry bout much, the leg room is good, interiors is good & improved & maintenance of maruti cars has never been problem, so on an overall evaluation Duo is a better option of the two.