My personal opinion & experience with sterling silver and Argentium:
(Disclaimer: the more experience I get, the better my sterling
silver comes out, and the less I need Argentium!)
Color: Initially, sterling (ss) and Argentium (Arg!) look the same;
a bright white metal. After a bit of exposure to atmosphere, flame
and body oils, ss has a cool blue tint, and Arg! has a subtle yellow
(I/J diamond) tint. Kind of muddy, to my eyes.
Soldering: Arg! will wilt under the flame a lot quicker than ss.
(Hence the nickname, "Arrrrrrrrrrrrrrrg!)
Fusing: If you don’t have fine silver, Arg! is the cat’s meow. No
solder needed, just observe carefully and have a delicate touch with
the flame. SS however, has to be soldered, every_single_seam. Guess
which one I use for loop-in-loop chains?
My experience is solely in fabricated jewelry, not casting or objects
like boxes/candlesticks. Eventually I will phase out Arg! > Given
what I do with silver, it just doesn’t meet my needs. Your mileage
will vary, depending on your talent, needs and skill.
My story, and I’m sticking to it.