Evaporated milk is essentially whole milk with less than half its original water content, so it’s basically concentrated milk.
However, due to being concentrated, evaporated milk will typically contain higher amounts of nutrients and more calories. Added sugar and other ingredients the manufacturer may have added also have to be considered.
But for the most part, evaporated milk is the healthier choice. And just like fresh milk, It offers the nutrients needed for healthy bones, such as calcium, protein, and vitamins A and D.