Ok, I have a UV brandish with medium undead and low construct. I've decided to keep it and go down the elemental brandish line with it. What I'm trying to decide is whether to go with fire or ice. Here's my rationale:
Glacius-
Fighting with a glacius is slower than fighting with a Combuster, as it's strength isn't in damage, but crowd control. Therefore, especially while soloing, placing charges well is more important than spamming them. So, a single well placed charge will freeze something like a gun puppy, then I can circle and follow up with a stronger attack. Or, a single well placed charge will freeze most of the mob. I can leave them, clean up those I missed, and when the freeze breaks, rinse and repeat. Also, Glacius is a little more useful for vana runs.
Combuster-
Combuster relies on dishing out damage. So, the bonus damages make the combuster even more powerful. That's really all I have for this one.
Doesn't matter-
Because the bonus damage is only 14/7%, that equates to one less attack per 8 or 16 (rounded). Big deal. There's not much that takes that many hits. Maybe for boss battles it will matter a little, but otherwise, it just doesn't matter.
Any thoughts?
I discuss this in my sword guide, as you may know. There are some points, that I must emphasize:
In general: Combuster's charge attack does *significantly* more damage than Glacius', because monsters always ride the entire wave of explosions. Also, you can depend on the monsters to be knocked back a great distance. This is a kind of crowd control, that Combuster has and Glacius doesn't!
Specifically in FSC: Glacius is not more useful than Combuster. I have both, and without question I prefer Combuster in FSC. The fact that most enemies ignore Combuster's fire doesn't matter, because its charge attack still does huge damage, with big, predictable knockback. Think of Combuster without fire as the same thing as an elemental Acheron --- which is great.
I'm not saying that Glacius is bad. If you want to play with a careful, deliberate style --- which is useful if you're learning FSC --- then Glacius is great. I just don't want you to discount Combuster's charge attack for the wrong reasons.