ivangterrace wrote:Kinda depends on the role your dreadnought is fulfilling because they can do a lot of things.
For long range anti-tank, you got the dual autocannons.
For a generalist dreadnought, you can take a multimelta and replace the storm bolter with a heavy flamer. You now get some awesome anti-tank, some anti-infantry firepower, and you still can hurt some people in close combat with that dreadnought fist.
For close combat dreads you have to go with an ironclad in the normal space marines codex or furioso/Death company dreads in the BA codex.
For long range anti-tank, you should take the dual lasercannons.
The Autocannons should only aim for transporters, light tanks or other vehicles.