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So my gaming group is starting up a Great Crusade/Horus Heresy campaign, and we are all picking Legions to do. So far, i've narrowed my choice down to two legions - Iron Warriors and Alpha Legion.
PROS and CONS of Each:

Iron Warriors

Pros: Cool color scheme, easy to paint, I like their tactics, and they can be used with my other CSM as long as I cut off Imperial Icons.
Cons: I don't like the gold and silver combo, I'd rather just have silver. Also, Iron warriors are a tad overdone.

Alpha Legion

Pros: Cool color scheme, fun to paint, interesting fluff, and you don't see them very often.
Cons: Cannot be used with other Chaos Space Marines (their color scheme changed) and I don't care much for their tactics.

Thoughts?

Friends don't let friends jump on the pre-heresy bandwagon.

Anyway.

You can use and CSM for any CSM codex technically. If you want to use your alpha legion as CSM, you can. I would go for alpha legion, after all, iron warriors players are pretty damn common if they are from the older CSM crowd.

Don't worry, we are converting everything so there's no jaw-dropping Forge World prices we need to worry about.

Alpha legion since they were one of the younger chapters