I am not what you'd call a serious jewelry maker, it's a hobby and I'm mainly trying to reproduce older styles, so what I say may be very unlike what others will say.
I use copper and brass wire, I also use copper and brass components like ear wires. I think you wouldn't want to make ear wires from brass because it oxidizes green, but there are some very fine, American made brass ear wires that have been finished so they are completely stable. Trinity Brass is a good company and so is Vintaj. I mostly use Trinity Brass. Personally, I have very fussy ears, inclined to flare up if the wire isn't perfect, and they give me no trouble at all.
I think copper wire is better to work with for ear wires, but I could be wrong. Maybe someone else can comment on that.
There's nothing like sterling silver, or course, but copper is very nice wire to work with. Brass is harder and it takes some getting used to. I hope that's helpful.