Ah.. Ghaz would get my vote.. but it would be extremely close between him and Abaddon... Abby would be relying extremely heavily on Wargear too.. which just aint proppa. Weedy even.

Abaddon, this is unquestionable by far.

Another devouter of Chaos. Welcome to the forums!

We are not talking about gameboard, right? Lore-wise: Eldrad beaten Abbadon once, he will do it again... Eldar easily manipulated Gazghkull, so he is not dangerous, Calgar is good rivalry, but he is just Space Marin and tied to his precious codex, so it is Eldrad, who will win! Unfortunately, he is dead already...

It all depends on whether we factor in plot armour.

If we do, Calgar then Eldrad, then Gazghkull, then Abaddon (1st to last)

If we do it properly, probably Gazghkull, Eldrad, Calgar, Abaddon

Big Fight. Abbadon comes first, followed by Marneus.

Actually if you read the fluff and understood what he is trying to accomplish, then he actually won 13 times

Abaddon!

Asmodai would stand victorious over the corpses of his foes.

The Dark Angels always claim victory!

Time for some ass whooping, traitor scum!