In my own personal experiences, having played a Dwarven Xbowman, use both the HCoS and the LCoS. Depending on what you need. HCoS does brutal damage. It is sort of like a bazooka. You point, you shoot, stuff dies. The LCoS is sort of like a pistol. You take it out only when you have to.
As for the HCoA, I find that it works well in Keldorn's hands. He gets a nice low THAC0, making him useful for sniper work.
It should also be noted that heavy xbows seem to have fantastic range abilities.
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