Out of all three models, Suzuki wagon R is a better option due to these reason
1. All three operate in 3 cylinder engine. when it comes to 3 cylinder, dynamic balancing and overcoming the vibration have been a challenge for decades. But Suzuki has manged to get around this problem to a satisfactory level. When you sit on all these models in idling, you feel the difference. So better go and experience by yourself rather depending on what others say.
2. When it comes to maintenance, there is no big difference out of all three. But Suzuki engines are very reliable and less wear and tare. I don't agree with the below post of early stage sludge formation. It happens either if you use wrong type of engine oil, delayed oil replacement or problem with the oil filter. Our people are very smart to change odo meters, be careful to get it from a reliable place unless it is not from agents.
3. Interior quality ( comfort, finish) and other options are far better than other two models.
In Question:
1. wagonR are, kei models , so they have physical car size and engine capacity limitations. Example you are not allowed to carry three people in rear seat. Other two options comes with 3 cylinder 1.0 L engines. So people think it may be quicker in initial pickup. But for me I don't find any issue , since it uses s-ene technology. During the pickup, it extract additional power from the hybrid battery. If you can manged to get a turbo version it would be far better. But only a few people getting down turbo versions.
2. Idling stop: WagonR is built to save power. so it automatically stops the engine in longer idling times. If you do more frequent stops, it may be a problem to the life of the hybrid battery.
3. Other two models are non-hybrid. So if you worry too much on hybrid battery life and replacement cost don't go for a wagon R. Usually you don't get any problem with the hybrid battery within first 5 years. But our car dealers are very smart to swap the batteries with unused cars.
trish_auto's post in Sting ray, Axia, wigo was marked as the answer