Captain America: Strength, power, and muscular endurance
Achilles: Speed, cardiovascular stamina, and agility
__________________ "Compounding these trickster aspects, the Joker ethos is verbally explicated as such by his psychiatrist, who describes his madness as "super-sanity." Where "sanity" previously suggested acquiescence with cultural codes, the addition of "super" implies that this common "sanity" has been replaced by a superior form, in which perception and processing are completely ungoverned and unconstrained"
The only advantage to a dual-ended blade of any kind is that the striking sequences are less predictable.
An area in which Achilles thrived - that and his kinetic speed. Dude had dexterity through the roof. Plus he had power, strength, and his muscles didn't seem to wear out. But they're no SS serum.
__________________ "Compounding these trickster aspects, the Joker ethos is verbally explicated as such by his psychiatrist, who describes his madness as "super-sanity." Where "sanity" previously suggested acquiescence with cultural codes, the addition of "super" implies that this common "sanity" has been replaced by a superior form, in which perception and processing are completely ungoverned and unconstrained"
Don't forget that he can activate only one blade if wants, like Darth Maul did. Captain America is not even proficient with swords, while Achilles is quite skilled and also immortal. This an easy win for Achilles.
It's pretty heavily implied that he was. But even if he wasn't he's still far more skilled with a blade, has a better weapon, and is at least as fast and agile as Rogers.
Strength and speed are important but they're not as big a factor as skill, at least when it comes to swordfights. Achilles is obviously more skilled in swordplay. Cap will end up just winging it.
I'm not sure if you're agreeing with me or not. I'm saying Achilles has the advantage because he's actually trained with the sword whereas Cap will just be winging it.
If we want to be technical, Achilles won't have much if any advantage. As a lightsaber weighs faaaar less than a sword. He'd be just as off balance as Cap is inexperienced with a bladed weapon.
But Cap's physical superiority in all areas imo means he wins regardless.