Last Bonfire on Arden or Sigurd?

Personally, I'd probably inherit Bonfire to Sigurd since it's easier to activate and Ignis to Arden since he starts firing off quad-hits at low health.

Isn't Ignis actually better for Arden anyway since if he's quadding, he's going to get Ignis in one turn?

Edit: The more I think on it, it's pretty six one, half dozen of the other on which is better. In most cases, Ignis is better though. It's only under scenarios like dealing with Firesweep wielders or magic users knocking him out of Follow-Up Ring range, but there's absolutely no reason though to run anything other than the Brash Assault seal on Arden to guarantee he quads under every circumstances. If anything, I think it's Ignis vs. Aether, although Aether is pricey and thus should only be used if you're seriously looking at using Arden for Arena.