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The difference is that one of them is a "Heavy Duty" (stiffer) shock (the more expensive one) and the other is a "comfort" or standard shock. If you just drive your car (no sporty driving) then I would go with comforts. If you like a harder ride and do sporty driving, go with the Heavy Duty ones. I have Heavy Duty on my car and it is a bit firm, but sporty. On my other car I have the comfort shocks and it rides quite nice.
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