well the amber ultem doesn't really show fingerprints much at all and the gloss makes it really easy to just wipe fingerprints or juice away with no effort, the high gloss means nothing really sticks to it so it just wipes away easily like it would on glass, and yes the high gloss is more transparent than a satin when it comes to amber, think of it as clear glass compared to frosted glass, satin ultem is much like frosted glass so it's a bit less transparent...
if we're talking about the black then yeah, I don't know of any dark shiny surface that wouldn't show fingerprints really, but the real difference between ultem and aluminum is that aluminum is very soft, so much so that if you have something that is polished aluminum and get some fingerprints on it, just the act of wiping away the fingerprints will cause micro scratches on the surface which means smudges, and it's almost impossible to keep a polished aluminum looking great because every time you touch it your actually causing more micro scratches and smudges so polished doesn't stay looking great unless you never touch it, not so with the ultem. the surface is much harder than a polished aluminum surface, so you can just wipe it off on your shirt and it returns to a high gloss, much like glass really... in many ways ultem is more durable than aluminum, including the gloss finish...
if we're talking about the black then yeah, I don't know of any dark shiny surface that wouldn't show fingerprints really, but the real difference between ultem and aluminum is that aluminum is very soft, so much so that if you have something that is polished aluminum and get some fingerprints on it, just the act of wiping away the fingerprints will cause micro scratches on the surface which means smudges, and it's almost impossible to keep a polished aluminum looking great because every time you touch it your actually causing more micro scratches and smudges so polished doesn't stay looking great unless you never touch it, not so with the ultem. the surface is much harder than a polished aluminum surface, so you can just wipe it off on your shirt and it returns to a high gloss, much like glass really... in many ways ultem is more durable than aluminum, including the gloss finish...