User blog comment:Word Bearer333/Best Space Marine Legion?/@comment-2253300-20130323204954

My vote is the good ol Sons of Magnus. Please note that I am definitely biased, but my prediction is not groundless. First off the Thousand Sons are small, but they are also extremely smart. Their penchant for clever strategy and misdirection are rivalled only by that of the Alpha Legion and Raven Guard. They would definitely fight smart, avoiding battles they couldn't win, and allowing the others to wittle each other down while pulling strings.

Secondly Thousand Sons officers are very individualistic and self-dependent. Officers in the Thousand Sons are knwon for being able to take care of business even when they are isolated from the chain of command. Near the end where things get hectic, and people start to become less cohesive as a military force the Thousand Sons line officers will still be effective, and keep those Marines under them on task even in the maddness.

Finally and most importantly the Thousand Sons have their immense Psychic power. This allows them to use tactic that the other Legion would unavailable to other Legions either due to the lack of number, or the lack of quality of their Librarians. In addition the Thousand Sons would not have to worry about Ammunition, as they would still be able to use their considerable psychic power to defeat even armed enemies well after the last Bolt was spent.

Now I know what some of you are thinking. "But Supah! Russ and the Wolves thrashed them at Prospero!" Yes, this is true, but there are factors to take into account with that particualr battle. First of all Magnus, in his guilt towards having foiled his father's attmept to breach the Webway, blocked the Thousand sons ability to detect the Space Wolves, and basically insured that the Wolves had caught the Thousand Sons utterly flat-footed. Secondly the Space wolves were not alone. They had the Adeptus Custodes backing them up. In addition a force of Sisters of Silence were aiding them, whoes abilities as balnks made them particularly dangerous towards the highly psychic Thousand Sons. Even with all this it was an intense fight. Finally you have to realize that there would be a difference here. The Burning of Propero was a straightforward, head on fight between the Sons and the Wolves. The Sons were unable to choose the place or method by which to fight their foes, and it was one on one. In a battle with multiple enemies that are hostile towards one another, and assuming the Sons were not forced into a defensive position right off the bat they would have far more opportunities to employ clever tactics and usnique Sorcery against their enemies.