Project density, yarn usage, & shaping are the differences between fair isle and double knitting.
I have a preference for double knitting because it removed the issue of pulling and bunching that you get from fair isle and even intarsia.
I also like to use it as a cover for a secret pocket (this excites me a whole lot) because the seams are hidden behind the image. It is best to add the pocket before double knitting so your design yarn covers the seam.
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