Sorry, but Roboute Guilliman was the Primarch that Horus feared the most, as his tactical acumen, and numerous legion were seen as the biggest threat to the Warmasters designs. It was for this reason that the Calth atrocity was devised. The worst kind of treason, for the biggest threat.

Also, yes, Guilliman is the best Primarch. Ever.

The best primarch what a question there is no single best primarch out there they are all epic in their own right even the traitor primarch you have to be great to have such an impact on the galaxy and each of them deserves our respect but if i had to choose it would be simple

Leman Russ/ Magnus the Red /Sanginius /Vulkan

I did find the source of that quote, but surprise surprise it's in a 'biased' source. Codex: Blood Angels pg7. Regardless of that fact, it turned out that the next Warmaster was Sanguinius, and contrary to popular wishes, not Roboute.

I just find Guiliman that bit more focused on organisation, paperwork kinda stuff... but then it's purely subjective viewpoint. Dorn and the fists to me personifies what spacemarines should be in defense and offense, no wolfen fang and claw nonsense, no blood lust crazies, no strange unit compositions, etc.... Dorn is to me the thinking general that takes the proper things into account.

Guiliman thinks too much so to speak in my subjective perspective ;D but other than that yes...Guiliman and Dorn is properly the most pure visions of what spacemarines should be.

Except Dorn is unyielding to a fault... To the point of undermining his goals in some cases. He is a bit of a masochist, which I think is a major drawback in a Primarch.

Angron, because he has cool haircut and dual wields axes, how badass is that

and he's got the nails in his head that are slowly but surly killing him and degenarating him to a a beast that has a short concentration spawn and only pain and killing in mind not saying that he isn't cool or anything but he is a broken one and does posses some attraction cause of that but didn't he lose his dual axes and replaced them with Black blade

All must be respected for to underestimate your enemy would lead to downfall.

I was referring to the "human" Angron, because atm in his Daemon form, he really has no haircut whatsoever
And yes, his axes got broken when he was buried alive by Ultramarines (damn Ultramarines!) on Armatura. And since he is a Daemon Prince, Nail problem is long forgotten

I'm saying, we all want to kill stuff, and he's the best guy there is at killing. So I vote for mister Angron

point taken XD wasn't rly sure what state of the lore you were reffering to him XD but now that's clear yeah i see how epic he could be