5th Ed Space Marine codex states it was Guilliman due to his tactical genius and diplomatic skills.
So thats 2 conflicting sources so far!
I make a habit of purposely not buying Space Marine Codices! Even though I own most other Codices, so thats why I wasn't aware of this particular source
And it wasn't Horus's combat abilities that killed Sanguinius it was his pshycic abilities and the fact that he shattered his mind, Horus did weaken Sanguinius in the actual fight but that wasnt what killed him.
I was under the impression we didn't actually know how Horus killed Sanguinius. Only that when the Emperor turned up, Sanguinius' body lay mauled at the Warmasters feet.
Originally Posted by MontytheMighty
everyone knows the emperor was going easy on him, like a father would with his wayward son
If you havn't done so already. Try reading the account of the Emperor's duel with Horus in the Collected Visions. Its not as straight forward as you might think.
Fulgrim i find to be a definite no since he couldnt even beat Ferrus without cheating. Ferrus wasnt known for being an awesome fighter either (relative to other primarchs).
And from what i understood about Magnus, he was the worst hth fighter of all the primarchs but his psychic abilities more than made up for it.
I havnt read 'Fulgrim' since it was released so may be wrong here. But he didnt cheat when fighting Ferrus Manus at all. It was only after he had beaten Ferrus in a duel that he found he couldnt bring himself to deliver the killing blow.. then he allowed the Daemon to take over. Thats not cheating.. he beat Ferrus without the Daemons Help (If memory serves!!
And no Magnus was not the worst fighter of the Primarchs. He was the largest Primarch and was extremley strong. He would have killed Russ were it not for the actions of Wolf Lord Garm. So if you want to get technical Magnus is actually a 'better fighter' than Russ, because Russ had to 'cheat' to beat Magnus!!