I think its good to have a mix, heavy bolters and auto cannons. Autocannons are great at killing light-medium vehicles, but can also be used to kill infantry and alot else. Heavy bolters are very effective aganst infantry with 3 shots a pop.
I tend to prefer autocannon. While the Heavy Bolters do have a higher rate of fire, they don't have the range or versitility I want. It all depends upon how you use your heavy weapons, and the way I do mine, it doesn't make much sense to take Heavy Bolters in my infantry (I leave my heavy bolters on my Russes, where they belong).
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