Depends. Arqubuisers are more there for the morale drop (-6 instead of -2) for a quick rout, rather than damage. They don't replace arbs, they're a minor complement to them. They do got better accuracy than handgunners, so that point blank volley works a bit better as well.
It's a personal preference thing. I think more people prefer arqs compared to handgunners actually, even if neither is really popular.
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