Olivia Weapon

So with the most recent tempest trials, I grew to like Olivia quite a bit, fulfilling the role as a red unit while having dance. Her stat spread is pretty amazing as well, minus the fact she's anywhere from 8 to 14 BST less then the top red infantry units. I figured this is salvageable considering she has the powerful dance ability. Considering I have a few of her I want to begin the 5* merge process. Her role as a swordsman/dancer led to having a fantastic array of skill combinations, but the ones I have chosen are pretty much set in stone as they suit my personal play style. I am currently however stuck to what weapon I should use, and wish to get a few other opinions on this matter. Keep in mind I'm looking for an optional balance between combat and support, prioritizing dance over combat and only having to fight against greens. My three choices are as followed:
1.) Silver Sword+ +Spd: the strongest overall option of the bunch giving +16 Atk
2.) Armorsmasher+ +Spd: more meta based, 2 less Atk at +14 Atk but provides bonus damage against armored units, some of the tankiest meta guys around
3.) Kadomatsu+ +Spd: at +14 Atk and no bonus damage, this is the support option, giving +2 Def/Res to allies at the start of the turn. In this case, I would most likely swap out her seal for Distant Def or Atk+3