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One difference is the color. But the real difference is just in the included accessories. If you google "shark rocket complete HV320 versus HV322" you should find a page with a table of the accessories with each model. IMHO, the 321 is the best value - I wanted the wand tool and the motorized brush. Here's one such page: http://www.pickvacuumcleaner.com/reviews-and-recommendations/shark-rocket-complete-with-duoclean-hv380-hv381-and-hv382-models.html
Sorry, there was a problem. Please try again later.I believe each comes with different accessories. However, if you buy a particular model from a store double-check the box for the accessories included - different stores selling the same model number can have different accessories included. On the shark web site there is a feature so you can compare the models side by side to see the differences.
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