Pics below for reference.
Both costume versions are for me better than the normal cards.
Costume Domitia looks really good for off to extra protect with the cleanser effect. If you do not have many heroes with this ability it could help you in war off.
However Sartana costume is probably one of the heaviest snippers and if you are planning to emblem her she would be also an option in deff at the wing spot.
I would go Sartana Costume version (in fact I did do this & she’s now +18 as my War Wing Defender).
Fighter Class is one of the most lethal in the wings & can really screw up your day in offence. Plus her damage is best of the purple snipers (jabberwock excluded on a single target) and will serve very well
In a nutshell, Sartana >> Domitia
Costume Sartana > Normal Sartana.