As a subject matter expert in confectionery products, I can provide you with a detailed comparison between Smarties and M&M's.
Smarties are a brand of candy-coated chocolate manufactured by Nestlé. They are typically small, round, and flat in shape. The standard size for Smarties is about 0.39 inches (10 millimeters) in diameter.
M&M's, on the other hand, are small, round, and smooth chocolate candies coated in a colorful candy shell. They are produced by Mars, Incorporated. The diameter of a typical M&M is about 0.59 inches (15 millimeters).
Comparing the two,
M&M's are larger than Smarties in terms of their diameter.
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