the best city in the world

I have notied that everyone think the the city which he/she have lives long is the best one. It is merely because of they have get used to live this specific city. They know where to find the best amenities and where to buy cheap and better quality things in this city. They don't know other cities that well, thus they think their city is the best.

It also occurs to all mammals that migrating to another place might cause mental stress and even being afraid of the new environment. Cat is the best example.