Leaving my opinion. Haven't really read the thread, just thought I should leave my thoughts. Feel free to disagree with me or correct me if I'm wrong about something.
Sword skills goes to Bradley, while Dust isn't a push over his own on screen feats aren't anywhere as good as Bradley's insane swordplay. Though Dust doesn't rely on just his sword skills alone. With Fidget by his side his Dust Storm attacks are very troublesome to deal with.
While the standard dust storm is very stationary,
the aerial dust storm will allow Dust to move and fly through the air. With Fidget's magic + his storm he can unleash a large amount of projectiles that are strong enough to harm people that have comparable durability to Dust himself. Or can take hits from Dust.
They're a bit weaker but can hurt and stagger/juggle opponents. This combo produces numerous, hit multiple times, and will follow targets. Dust will likely rely on the Dust Storm + Fidget's magic to land hits on Bradley. As he is a skilled warrior, he'll quickly realize that fighting Bradley up close is bad idea and will back off. And he can keep his distance while attacking at the same time with the Aerial Dust Storm + Fidget's attacks.
Taking advantage of his enemies' weakness or his own advantages isn't something that'd be out of character. And I don't think Bradley will be able to kill Dust in their initial clash of swords. So Dust should have the chance to back off and start hounding him with magic.
Fidget's magic would normally be impossible to dodge even with Bradley's skill, due to their homing properties and numerous amount. However with his Ultimate Eye he might be able to avoid some or even most of the normal magic projectiles, but I think he'll still take hits.
However I think the most dangerous of
Fidget's magic is her electric attacks.
These can't be avoided in game and instantly reach any enemies on screen. This will literally be shocking, which can really mess up Bradley as he can't avoid it. At the least the attack is so fast that Dust nor his enemies that scale to him cannot avoid it. As I said the movement in game just instantly travels.
I don't think Bradley would be able to take many hits from Fidget's attacks, at least he won't last long enough to tire her out. Bradley's stamina feats are good in the moment, meaning he can take punishment and keep going, but lacks any good stamina feats of being able to fight all out for a long period of time.
I don't think Bradley has what it takes to close the distance between them or outlast Fidget's output. Which in universe, outside of gameplay I mean, has been able to keep up with Dust throughout his adventure without tiring out mid fight at all. Despite fighting many battles one after the other or even fighting against an army.
So yeah. I'll vote Dust. His combo with Fidget is too much for Bradley, who hasn't dealt with projectiles on par with what the Fidget + Dust Storm can do. Along with lightning/electric attacks that
seemingly cannot be avoided by people on par with Dust himself.
Her projectiles are only slightly weaker than Dust as well, and are most likely just on par with him. Seriously her magic attacks with Dust Storm is really busted in game.