It is a very fine question to ask, and it requires a lot of studying up on the details. You must consider the designs and discern between them. Additionally, you must look at their manufacturers and where they are made. Also, you have to consider the quality of each watch. For Patek Philippe, they must invest in many more technologies than Rolex. This is because the brand is quite expensive and well respected. Many people do not know that Patek Philippe watches are hand-made one by one in Geneva, Switzerland. This is a very expensive part of the world to live in. It is considered to be one of the most expensive cities in the world when it comes to living standards. It is Switzerland where all of the best watch brands are made. This is not because the Swiss are naturally better at making watches, but because they have more time to invest in the different technologies.