The key difference is how they are produced and the material the image is printed on. Dibond prints have the image printed directly to the surface using large UV-Flatbed printers, while HD Metal Prints use a dye-sublimation approach. Dibond prints are great for general graphics and are more versatile in where they can be displayed, while HD Metal Prints are more likely to be used to print photos and fine art.
More detailed information on how they differ can be found in our blog:
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dibond-prints
HD Metal Prints