I am confused between swift dzire zxi (petrol) and i20 sports CRDI, both costs almost same, my monthly average running is 1000 km. I am confused specifically due to lesser ground clearance of i20 but better interior and features of i20. Mileage of swift dzire also matters. Please advice me.

1000 Km monthly run, thats high, both have peppy engine but if you are looking something which gives you more upclass feeling then go for i20 sports however swift is really nice car, it scores better in overall package. Is there any inclination towards Maruti ?

You are comparing cars of two different leagues. Firstly you should decide if you want a hatchback or a sedan.
I would suggest the dZire as it is the better of this lot in almost every aspect according to me.

Oh man.. I just over looked that he is talking about Swift Dzire, I thought he is asking for Swift.. certainly as Manoj said, both are not really from same category, Dzire is mini sedan while i20 is hatchback.
So what kind of car you are looking for ? Hatchback or Sedan ?