Having never been stung by either, I could not possibly comment from experience. However, the Schmidt Sting Pain Index puts bumblebees and common wasps at 2.0 and European honey bees slightly higher at 2.x.
Do the barbs really make a difference? They're smaller than our nerves can possibly distinguish. I understand that they only get caught in the elastic skin of vertebrates and improve the effectiveness against other bees, which they can sting as many times as they like.
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