If you are talking about pricking irons, Blanchard are a bit higher quality than dixons, finished off a bit better, I've compared them side by side
But the marks they make on the leather ? I doubt you would notice any difference , tool longevity ? I doubt you would notice any difference, they are both very well made & made for pro use.
However, price wise, there is a huge difference between them, if you are going to order a few different sizes the Blanchards quickly become crazy money.
The goods japan ones are made for punching diamond holes, very different to the dixons/blanchards , still good, but a different tool entirely in my opinion & if you want to do high stitches per inch then dixons/blanchard are your only choice.