See, when it comes to New Cultus, Swift, and WagonR, it comes down to your individual preference rather than the price of the car because they are more or less in the same price bracket. As a wagonR owner, I drove other cars and here are the pros and cons of each car that I assessed:
Suzuki Swift:
Pros:
1. Best performance in class, can beat the likes of Corolla, City, Cultus, WagonR in a race.
2. Well balanced car with excellent handling and suspension.
3. Good comfort and does not lack important features.
Cons:
1. Lack of air bags.
2. Gass Guzzler (12kmpl for manual and 10-11 for auto)
3. Old shape.
4. Expensive parts.
Suzukii Wagon R:
Pros:
1. Cheapest option
2. Ultra Spacious
3. Great fuel economy (15-17 kmpl)
4. Low maintainance cost
Cons:
1. Only available in manual
2. Tall body makes it unstable
3. No safety equipment
4. Uncomfortable seats despite great suspension
Suzuki Cultus (2nd gen):
Pros:
1. Safety features
2. Available in auto
3. Ultra fuel economy (17-20 kmpl)
4. Has all features in vxl
Cons:
1. Most expensive (auto model touches 17 lac)
2. Reports of suspension issues
3. Relatively expensive parts
So decide on what is important for you in a car and then make a decision. Let me tell you that these new Suzuki cars are really reliable and tough with excellent economy and durability in terms of engine.