You should really look at the feats that Vader has:
He has armor that can resist blaster bolts and lightsaber strikes to a degree so i cant see his Zanpakuto doing too much damage... plus DVaders telekinesis can easily rip off large chunks of machinery or other nearby objects weighing multiple tons and flinging them at his opponents at high speeds.
Powers and Abilities:
Super speed, agility, strength and durability, precognition, Force-enhanced reflexes/reaction time, clairvoyance, telepathy, telekinesis, Forcefield creation, Enhanced Senses, memory altering and manipulation, mind control, Regeneration(low survived buried under rumble for at least a day and capable of healing a damaged lung), resistance to life manipulation(resisted the effects of the Muur Talisman which turns even force users into monsters known as Rakghouls), Empathy, Technopathy, levitation and other powers.
and as for speed http://outskirtsbattledome.wikispaces.com/ says they are =
and vader has relativistic reactions, aizen does not.
So yes DVader wins
What he said