Eh, I don't mind giving some money to support the game. *shrug*
Not familiar with Cordelia's kit. I vaguely recall hearing that she is one of the better lance users though. Camilla on the other hand has issues with the red heavy meta/enemy units.
I have no intention of going for the lunatic arena mission. I think I have enough dueling swords to pull it off, but no that is a ridiculous amount.
Cordelia's kit is all about Alpha Striking Red Units. She sports a Brave Lance/+, a fairly large Atk score (40 at lv 40 4 star; Brave Lance+ would make it 44 before 5 star growths), and Triangle Advantage (which ups type advantage damage at the cost of type disadvantage damage). At 4 stars, the best you can do is Astra for activation skills (takes forever to charge, but adds 150% damage to the next hit), but at 5 stars you can choose between Astra and Galeforce for hit and run shenanigans (though it still takes forever to charge).
Camilla meanwhile is all about Savage Blow and not dying immediately. Even with Brave Axe+ and 5 star growth, my Camilla has 37 Atk, which isn't all that great, but she does get a +6 Spd bonus for attacking (which can lead to some unlikely doubles, even in the face of the Brave weapon penalty) and Moonbow is relatively quick to charge and can turn a series of light hits into a one-round KO. Of course, Camilla still lacks power and her HP total keeps her from tanking for any significant length of time.
That being said, new focus that I literally do not care about (4 star Fir's already on my A team (and dragging it down since she's only a 4 star), and I've got two Adult Tiki's to begin with).