If you run her with Bennett or Sara, you always want Electro% goblet.
If you aren't, then you might want ATK% -- if your sands is ER%, ATK% goblet will be better.
If you're running ATK% sands without Bennett/Sara, Electro% is probably better unless you're running Catch R5.
Ultimately it'll most likely come down to substats, Genshin Optimizer should be updated with Raiden so you can always plug your build & artifacts in there and see what you get.