Well, off the top of my head; you get to roll four dice for two machines with swift reload versus three dice for three individual ones. Meaning that you are more likely to get more shots with the swift reload; but have a higher possible number of shots with three individual machines.
So it's really a case of how far you trust your luck. Swift reload gives you better odds of getting 6-12 shots, but three machines gives you the theoretical possibility of getting up to 18. When all is said and done, you'd probably find they averaged out about the same over the course of a game (iindeed, that's the intent behind the costing!)
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