No upgrade to A320/330 at Kingfisher, if they promise you st. donīt buy it (DGCA rule is no problem if company provides the training). You can ask guys who have been flying with the company from the beginning (over 3 years) and after all the promises had been made the are still jumping shorthauls with ATR...
To bring family is safe, food, schools and medical facilities is no problem, but the quality of life depends quite significantly on the city you are based...
At KF you would be flying all over India, nice and colorful country.
The serious issue at KF is rostering - no valid roster, only phone calls the evening before. Means no privat life, you never know if they donīt position you the same day evening for next few days somewhere (which happens very often).
Money on time, recurrent sim no prob.
My suggestion - go to JET, flight ops / rostering under control and better money.