If you are looking to do actual gravel events and/or bikepacking then you'll want/need larger tires than 34mm, which is the max on the Caledonia.
I own an Aspero and am extremely happy with it, and I think that it will suit your needs better than the Caledonia...the more I look into the Caledonia, the more I realize it's just a less versatile Aspero. Unless if you jump up to the Caledonia 5, then I think that they is enough of a difference to where one will suit someone better than the other...or give you an excuse to get both
Stick with the Aspero, pick up a second set of wheels, and you'll be very happy.