Iron Warriors all the way. Though I've got quite a few legions I enjoy for specific reasons. Angel Exterminatus simply put them in a new light for me. ( Not to mention Perturabo's development )
That's a hard one... Even though I place the World Eaters above all, it's a very slim lead (mostly my unyealding liking of Khorne and the way they handle their business)... But bellow them... damn, I don't know... There are very few Chaos warbands that I DON'T like, tbh ...
World Eaters. A rage that consumes all in its path, a warhost that will bash itself against any enemy until there is nothing but an ocean for blood. If you're not face to face with your foe, you're weak and cowardly. To hide behind spell, cover and bolter is the tactics of those with fear of death.
World eaters all the way just because I love khorne and all his followers and I find them to be the most blood thirsty legion
World Eaters Post-Heresy mostly but also after the Heresy. I like how they conducted themselves in warfare and there rituals(gladiatorial combat, scaring,etc.). And how they could care less what the other legions thought of them, they where warriors to the bone. A Rage unyielding and Prowess unmatched.
I actually like the concept of the Night Lords,they are the predator in your darkest nights,fear them,for when the sun sets they will come for you.Also,they dont workship Chaos. I might actually play as them while waiting for Tau to come out,that is if they are one of the Legions included.