Which Julia to keep?

Though +Atk is pretty good, -Res isn't. Keeping the +Spd -HP one is better imo.

See I built her in a more unconventional way and gave her Life and Death 3, Mine is +Atk -Def so I figured I'll try to raise her spd a bit since even with 33 res she'll probably get doubled by other mages at 27 spd. And with threathen res she gets more powerful and quick riposte helps her secure kills. It does depend on how you have her built and if you have a build which focuses on spd I'd use that one but if you want to focus on an Atk build then a bane in res isn't too bad. IMO +Atk all the way.