With no intention of picking a side and nor even weighing if one is better than the other, there is an interesting approach regarding the parents. To Islam, parents are so important that you should never leave them by themselves when they get old while in western culture, it is very common to send them to a special care house. This is a good point to consider for a further debate between cultures.
It does not always stay the same. The reason why is because there are sometimes people that we do not like, or we are having a bad day, our personal space is bigger, but when it is people that we do like, or we are having a great day, our personal space is smaller.