The copper certainly has its appeal, but my fave Overlander is the brass with a 3.25" (83mm) handle. It's the first one I bought and it's the one that got me hooked! I like all of my Overlanders, but the brass tops the rest. They all seem to shave the same, but the aluminum is noticeably different, obviously because of the weight difference.
Always a great shave with the Overlander, and that's without drama or irritation. Amazing.