Some questions...

The_Wandering_Ace said:

// What's your opinion on the choices/flexibilty/equipment,etc. of the Thousand Sons?

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Extremely inflexible. In fact, they're the most rigid of all the Legions, simply because their troops have very little options open to them. That doesn't mean they're poor choices for an army, but they do require quite a bit of experience and skill to wield properly.

The_Wandering_Ace said:

// How large do you usually field chaos marine squads?

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I field mine in eight man squads. This allows me to have an effective squad in Close Combat and still be small enough to infiltrate in most occassions.

If making a fire support squad (For example, a single Lascannon) then I only run five or six marines.

This also largely depends on which Legion you're playing - if playing a Cult army, then you'll probably want to look into favoured numbers.

The_Wandering_Ace said:

// In your opinion, what units do you think are more effective in general: Raptors or Bikers?

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Depends on what you want to do with them. Raptors can reach Close Combat very quickly, but they're just as fragile as a standard marine. Their Hit and Run rule allows them to break off and either turn their attentions to a different, more important target, or drop another round of fire into their opponents and claim another charge bonus.

Bikers are wonderful if you want to summon large amounts of daemons. They can easily turbo boost to a strategic point and rely upon a 3+ invulnerable save to weather them through the return fire, at which point hordes of daemons arrive to chew up the enemy.