1. Like Bopp said, I wouldn't bother.
2. DA is very good and has a lot of fanboys (me included haha), but I'm not so ignorant to dismiss the other brandish swords. Before I got my DA and Faust I was rolling around with Combuster and Nightblade. It's all preference here. DA = Glacius, it's just whichever style you prefer, and since you mentioned you like speedier swords, I'd go with Glacius. It really is just as good, even in FSC.
3. Bopp is legit again, FF or BTB, it's really just preference. I personally go with BTB, takes down wolvers easily enough and one-shot's Trojans in FSC solo. (I actually have the 4* Thorn Blade)

My pleasure, and good luck. =]

Tennis is right of course. DA is no longer magical in FSC, but it is still quite good. I've also used Glacius in FSC. I think I prefer DA for FSC.

When doing regular (not charge) attacks against a single enemy, Glacius does more damage per second than DA. However, DA has a much broader swing. So if you have multiple enemies standing close together --- as zombies in FSC often are --- then DA can do more total DPS. Additionally, DA has much bigger knockback, so it's better defensively (i.e. getting a crowd away from you).

Glacius' freeze is awesome, but in the hardest, tightest fights (e.g. last fight of depth 27), it's hard to maneuver to make full use of a Glacius freeze. I mean, even if you have time to charge, you may not be able to position yourself perfectly with respect to the enemies, so that multiple enemies are frozen. But maybe I need more practice. And I've never used Glacius against Vanaduke himself, admittedly.

Brandish line is my all around fav sword but u should focus on DA and Glacius. Barborous is awesome and so is acheron btw.