They do two different things.
Roll center adjuster doesn't "adjust" anything -- it corrects geometry of LCA on lowered car. Front alignment kit gives you camber adjustment.
I think the question you're asking is: should I get the J's or stock ball joints? If issue is just torn boots, boots are only a couple $ from Honda. But if you need to replace the joints and your car is lowered the J's would be a good choice.
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