Doctor Doom's combination of superior technology and sorcery overwhelms Vader's Force abilities.
Both are iconic armored villains, but Doctor Doom operates at a significantly higher power level. Doom's armor is more advanced than anything in the Star Wars universe, his force fields can withstand attacks from Marvel's heavy hitters, and his sorcery gives him mystical abilities that the Force cannot easily counter.
Vader's Force choke is his go-to attack, but Doom's armor includes life-support and shielding that would resist telekinetic compression. Doom has tanked hits from beings far more powerful than Vader and kept fighting. His own energy projection and magical attacks would overwhelm Vader's defenses.
The lightsaber is Vader's other key weapon, but Doom's force fields have stopped energy weapons far more powerful than a plasma blade. Meanwhile, Doom can attack from range with energy blasts, summon mystical creatures, and manipulate technology โ giving him vastly more options than Vader in any scenario.
Vader's Force powers allow ranged telekinetic attacks and precognition that lets him anticipate Doom's strategies. His lightsaber can cut through most materials, and his Force mastery includes abilities that conventional armor cannot block.
Doctor Doom's armor and force fields exceed anything in Star Wars, his sorcery gives him mystical attack vectors the Force cannot counter, and his technological genius means he could disable Vader's life-support with targeted EMP attacks.
Doctor Doom wins through superior technology, magic, and overall power level. Vader is formidable in his universe, but Doom's combination of Marvel-level tech and sorcery puts him in a class Vader cannot reach.
Darth Vader also fights
Doctor Doom also fights