Both Auto and Manual have its pros and cons....Swift auto is a 4 speed auto. The gear ratios are also not very impressive so the car will be a gas guzzler even on longer routes. expect 10 km/l from it and nothing more.
Go for manual swift DLX. Its sure a treat to drive. Impressive acceleration, good brakes, chilling a/c plus you can buy it brand new so no worries for at least next 3 years if cared properly.
If auto is must, i would suggest to go for a JDM with CVT. but beware, those things can get nasty if a problem arises.