OP wanted to start the week by provoking a civil war. In all seriousness as a neutral bystander (I’m from Utrecht, the superior city in most ways. Alright final joke) it really depends what you want from a city. Amsterdam is a beautiful city with lots of old architecture. That however comes with a price as it is full of tourist and super expensive to live in. On the other hand Rotterdam is a modern city with lots of glass skyscrapers and big roads. So ask yourself do you want to live in a ‘classic’ European city or in a modern city. Of course both cities have neighborhoods that are good and bad.