Which weapon gives me more damage?

I have no idea how much passive defense ignore cannoneers get, but wouldn't you be far better off using the empress cannon if you recubed it for a boss damage + def ignore line? Or even 2 boss damage lines? 16 more attack and 25 more str along with 6 set effect is nothing to scoff at.

1) I have over 100% def ignore regardless of the choice.
2) I have the 6 set eff regardless of the choice.

And yeah, i would, but i don't want to spend the cubes when i have other items that need it. Plus the cannon is currently at profit status right now and i don't want to ruin that.