Tabletop wise, Abbadon would win. Same with fluff I'd go as far too say. He's possibly one of the best warriors in the galaxy.
As much as it pains me to say. Codex wise and fluff wise (the newest one). Calgar would probably win. Plus isn't Eldrad supposed to have perished? I know the 13th crusade is a touchy subject in tern of 40K chronology but hey : )
"Yet a flicker of hope remained for Eldrad. After the noble Eldar's soul was believed lost to Slaanesh, all but a handful of his hundreds of Waystones became lifeless and dull. Yet if just one of the Spirit Stones retains its spark, Eldrad's soul endures whole somewhere within the Realm of Chaos, seeking its freedom -- or rescue." There's still a chance he's alive, so we assume he is alive, I mean which other Eldar Farseer could possibly be more powerful then him, to replace him?
At first I didn't think Gazghkull could win. His entire warfront got slapped around by Yarrick, a mere hummy. But looking at their back stories, they're both real badasses who really deserve having each other as rivals. Gazghkull's got my vote.
With equal armies Gazghkull would win. But if toe to toe you should run away from Abba screaming while hoping to hit him in the head with bolts , flamers , psychic powers , take your pick simply because of that sword it doesnt care what to cut. Take away the sword and he will do the running.
I feel the range at which the units start would have a great affect on the outcome. Say Gazhgull is close we'll he has power claw and mega armor. But he is still an ork so get as shootie as you want its only going to be a four or three.Lol.
