Best Way to Evaluate Competitor Traffic/Sales?

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What is the best way to evaluate the traffic of an ecommerce competitor? I'm looking to evaluate the market for a product very analogous to two products that are already on the market - what is the most effective way of measuring market interest in the competitor's product?

So far I have been using semrush. Is the traffic data that I get from these sites generally considered inaccurate? Any other strategies?

Thanks,

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