I recently started working with copper wire and I love it. It is so versatile! And I don't have to tumble it like I do steel wire. I can make the earrings, oxidize them and photograph them all at once.
With steel wire I tumble it for hours and hours to shine the wire. So I'll make the jewelry and I won't be able to photograph, edit and list on Etsy until the next day.
I really like the way copper looks when it's hammered, oxidized and sanded. So cool!