The only logical choice up there is Alpha legion, the rest obliterated themselves or got obliterated by another legion. Best to stick with undivided groups anyway. So in reality, you have Alpha Legion or the Red Corsairs being the two more notable CSM groups.
I'm extremely surprised World Eaters were not chosen. I'm even more surprised to see they're not leading this poll. Good thing I'm playing Space Marines instead. I was going to start a chaos character as well, but I dont think I will now.
I personally think for early on balance or lore, Alpha Legion works the best. The other Legions are too specific in both worship of the Chaos Gods and their troops. As there isn't a multitude of classes; you'd have a crippled Death Guard without Plaguemarines, or World Eaters without the Berzerkers.... or they have to be a rename of the 'unaligned' classes. Rubrics - Chosen?
It's going to be Alpha Legion, simply because they're the only Non-Aligned Legion left. Think about it, every Legion anounced thus far has been Undivided. It's liable to be for gameplay purposes, since these Legions are generally vanilla and field most Chaos Units.
IMO I don't think Thousand Sons should be the 5th Legion, now no offense to any TS lovers out there I think Rubrics are epic as well, but Lore wise it wouldn't make that much sense since Thousand Sons are basically Automatons, and secondly it would be weird to see them running around without a Sorcerer near them since this is how they are controlled. But anyway I really hope for World Eaters since their Lore and idea of them is just BADASS, but again all my opinion here so yeah.
