Before going for Wagon R, I did a brief 'Swift v/s Wagon R' analysis. In my humble opinion:
INTERIOR SPACE:
Wagon R is way more spacious inside than Swift. Even a 6 feet tall person can easily sit in the back seat of Wagon R, where as a person of same height will have to fold his legs in order to sit in the back seat of Swift (I have observed it). Two of my neighbours have Swift, one DX, the other DLX version.
FUEL CONSUMPTION:
No doubt, the engine of Swift is more powerful than Wagon R, but more fuel consuming as well. I had read several forums here before buying a car, in which Swift owners were blatantly complaining about poor mileage of Swift. Several Swift owners complained that the car was not giving more than 10-11 KM/Liter (One of them was complaining that the car was not giving more than 8-9 KM/Litre with AC). Wagon R has been giving me around 14-15 KM/Litre with 90% AC within city driving.
COMFORT ON BUMPY ROADS:
Swift is an uncomfortable ride on bumpy roads, where as driving a Wagon R is more comfortable than Swift on bumpy roads, probably because of its greater height, you feel low intensity jerks even on bumpiest of the roads (These are views of a Swift owner I read on Pak wheels). I have sat in Corolla as well, and found negligible difference in comfort level between Wagon R and Corolla on bumpy roads (My personal views).
EXTERIOR SHAPE:I am not at all concerned about exterior looks of a car.
ABS:
Wagon R doesn't have ABS, where as Swift does have ABS.
RESULT:
Since, Wagon R was clearly winning the interior space, fuel consumption, and comfort on bumpy roads contests, hence, I decided to go for Wagon R, and by the grace of Allaah, I have been appreciating my decision so far. I wish if Wagon R only comes up with ABS feature, it would then be a perfect package, given budget constraints. Cheers