There are pros and cons for both.
For joint families, you get to live together and relationships are stronger. The work needed to be done in the house is divided and therefore if someone is not well they don't need to take things to hard on themselves. There is more love between the kids and everyone who lives together, although it could be that way in individual families too. There are definately other good things about joint families too, but where there's pros, there are also cons. In joint families, many people are living together, and everyone is different. In most cases, differences within oneself or ones thoughts create conflicts, and there are conflicts in almost every joint family. These tifts may be small, but in the long run they slightly damage relations and the love within the family. Everyone wants things done their way and they may give in a few times, but after that they'll decide its useless and start living life the way they want to. and sometimes this can lead to people living together under one roof but still not being together. Although there are cons in living in joint families, I believe that the pros win over them. Sometimes people don't truly understand this until they live alone, in individual families.
Now for individual families... Well, you can live life the way you want to and have more freedom. Although you are far from people who are close to you, the essense of the relations is still there. Also, I guess if you try hard enough, you may still be able to maintain relationships almost as close as they would be in joint families. and the tifts and conflicts that happen in joint families aren't present in individual families. Still, there are cons to individual families. You are away from your family and even if the relations are almost as good as they are in joint families, they aren't the same. Sometimes, when children grow up, they don't get to know their other immediate relatives as well, and that causes distances between families. I guess in individual families, the pros and cons are balanced.
The choice between liing in joint or individual families depends on each individual person and the circumstances. According to me, I think both kind of balance out and neither one is better than the other.