The major difference between syrups is a lighter flavor

A bottle of golden maple syrup is typically priced between $12.99 and $15.99 for a 740 ml size. This amount offers slightly less syrupy goodness compared to the 1-liter plastic jug, which is available for $14.99 on Costco's website. Whether the smaller quantity is worth the price largely depends on your personal taste preferences. Similar to the original Kirkland maple syrup, this version is 100% organic and graded A — more on that shortly — and features a "golden delicate taste," as stated on the label. The syrup is sourced from Canada, which produces 71% of the world's maple syrup supply.
Golden syrups, harvested early in the syrup season, have a noticeably lighter flavor and color compared to amber, dark, or very dark varieties, which are richer and more intense. This syrup won't provide the signature robust maple flavor in baked goods due to its subtlety, but it is delightful when drizzled over French toast or yogurt with fruit. Its milder taste also makes it a great addition to cocktails, though it lacks the bold, earthy flavor of darker syrups. Both this new syrup and the original are certified Kosher, according to the product listings.
Both are grade A syrup, which doesn't mean exactly what it used to

Unless you're a dedicated maple syrup enthusiast or involved in the industry, you may not be aware of the recent changes to the maple syrup rating system. The previous letter-grade system was revised in 2015 to help clarify consumer confusion regarding the meaning of each grade and which one is considered the "best" or most premium. You may have noticed that all syrup bottles feature a letter grade—typically A or B. Both the new and regular syrups from Costco are classified as grade A. This classification system categorizes syrup types not based on personal opinion but through a strict, closely monitored process, with grades assigned only by companies authorized by a regulatory body.
Both varieties of Kirkland brand syrup carry the A grade, but the updated grading system places nearly all types in the A category, providing additional descriptors based on flavor and clarity. This means that while both syrups are grade A, two A syrups can differ significantly from one another. (What was previously labeled as grade B, often regarded as the most premium, is now referred to as "grade A very dark strong taste.") The original Kirkland syrup is classified as grade A amber, while the golden syrup is labeled as grade A golden. Which one is superior? That’s a question only you—and perhaps a stack of buttermilk pancakes for taste testing—can answer.
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