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Both are important, but it depends on your keyword targeting strategy, if you are trying to rank your Specific Product pages on Google, whenever someone searches for the specific product, then I would spend my time and energy there for SEO. However, if your specific products have no search volume or include long model numbers or something that people don't usually search by, then try to work on getting your product pages to rank for non-specific keywords related to that product. You can then also use the "Specific Product" pages to internal link to the "Product" page.