Swift is an expensive car than V2, so definitely if one can afford the choice should be swift.
Having kept both V2 and swift, major advantage of V2 is its engine. It is technically more advanced than swift. Its like comparing Liana engine with Gli.
One recent experience spark plugs of V2 are good even after driving 25K Kms, while in case of 2011 swift had to face hassle of changing spark plugs after 8-10K Kms.