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I'm just getting back into Space Marines and Crimson Fists. For the new formation, I need to have either Devastators or Centurions. Which do you suggest and why.
I have neither.

Now that there are grav devs, they're not wholly stuck in place, and they get free transports from the formation. Also, that's a lot of points to sink into high-priority targets without invulnerable saves or tank armor.

Then again, the dev/assault formation is where they get really threatening-looking.