Vitz is getting popular because of its dynamic shape and unique interior... the reason is, we, the third world people are used to experience the same late 80s style interior and exterior in the age of 2000s.... such as Cultus, Cuore, Indus Corolla till 2002!!! although Vitz is a 1999 car (the model which is most popular here), still is better than any newest local made vehicle.
Two of my relatives have got Vitz, one is around 70,000kms used while the other has some 44,000kms used... both are quite satisfied with their cars and havent cause them any problem as yet... According to them, Vitz still being 6 years old, is better than a local 0 meter car!!!
Vitz has Japanese origin and assembled in Japan... while Joy has a Korean origin and is assembled locally... so you can understand the kind of quality both vehicles would be offering... if u observe, you may find a difference between the 800cc exclusive (imported) and 1000cc Joy (local)!!!
and again, the resale.... the most important local market factor!!!! as u know, Vitz being a Toyota, would have a better resale, since a 20year old Corolla EE80 still costs around 3.75lac!!! while Joy, struggling to get its sales here... u know how much would be its resale!!!