Olivia Weapon

Out of those I would probably choose Armorsmasher. If you ever get the chance, Olivia works well with the Ruby Sword+ since because of her low stats she will generally have trouble taking out non-greens anyway. (just be aware it's not refineable yet)

Where's JBRoyal when you need him? XD

He loves 'Liv' as he calls her and runs Armorsmasher, so I think that's a good idea.