If it's style and performance that you prioritize most, then it's a no-brainer - the Swift not only looks better, it also drives better.

However, keep in mind that going secondhand opens up a new can of worms, primarily with regards to the condition of the car upon purchase. Aside from the risk of having worn out components, you also lose casa warranty. Of course, if you personally know the seller of the car and he gives you full disclosure regarding any repairs that need to be done, it gets much easier. But realistically, that's not always the case.

With regards to the cars themselves, while the Swift is technically classified as a compact, its space isn't all that different from the bigger subcompacts (i10, Picanto, Spark). Its pace though, is much faster, thanks to its 1.5L engine. It also handles much better. What the Spark has over the Swift though, is fuel efficiency. Since you're getting an MT model, the difference between the fuel economy of the cars is about 2 km/L in favor of the Spark.