All three of these are very niche bikes that are dwarfed in production volume by many other brands. None are really mainstream choices for most riders. How did you come down to these three choices and why aluminum? Can you give us a review of what you are looking for and where you ride and your experience level?
Aluminum forks are very unusual and carbon forks in just about every case are preferred, especially in a gravel bike where compliance is so important.
If high end aluminum is key the Merckx Strasbourg from 4 years ago was excellent but priced close to a carbon frame price, and the Cinelli aluminum gravel bike is one that may be available to you easily in Italy as well. I have ridden the Carbon version of the Willier and the Cinelli and handling on both is very good. I have a few hundred miles on the Merckx and found it absolutely outstanding if you can get your hands on a used one or new old stock as the Meckx is no longer made in aluminum however.