Best melee weapon for Viconia? (spoilers)

I'm wondering which is the best weapon for Viconia to use in melee - the Stupifier Mace (+1, but with 25% chance to stun on hit) or the +2/+1 electrical damage hammer you can get from Bassilus? I don't really want to give anyone else in my party mace or hammer proficiencies, and am considering giving her the ogre gloves anyway for serious sling damage (given that they're the *only* ranged weapons in BGEE which currently get the strength damage bonus added), which should be pretty effective with her 19 Dex.

There's also a +2 flail available later, I believe?