The Maruti Suzuki Ignis and Baleno share the 1.2-litre 4-cylinder petrol engine, which is known for its smoothness, refinement, free-revving nature and fuel efficiency. The Ignis is relatively smaller in size than the Baleno, and with its light controls, will be a touch easier to drive and park in tight spaces.
That said, the new Maruti Suzuki Swift is still an excellent, fun-to-drive option, with a nicer steering (it returns to centre more naturally than the Ignis' unit), and its darty nature. Its 3-cylinder petrol engine is also very good in terms of drivability; yes, it doesn't revv as freely as the 4-cylinder 1.2 unit, but if you don't regularly spin the engine beyond 4000rpm, it'll keep you satisfied.
Do drive the new Swift once, it might just be the one for you.

