According to Shark, the Shark Rocket DeluxePro HV321 and TruePet HV322 have Superior Carpet and Bare Floor Cleaning that cleans better the HV310. And the dust cup is also larger.
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Compare Shark HV310 and HV321,HV322 Specs Side by Side
| Shark Rocket Deluxe HV310 | Shark Rocket DeluxePro HV321 | Shark Rocket TruePet HV322 | |
|---|---|---|---|
 |  |  |
|
| Design | Upright/Handheld | Upright/Handheld | Upright/Handheld |
| Bagged or Bagless | Bagless | Bagless | Bagless |
| Clear Dirt Cup | Yes | Yes | Yes |
| Power Source | Corded | Corded | Corded |
| Cord Length | 27 foot | 30 foot | 30 foot |
| Power | 120V, 60Hz, 500 Watts | 120V, 60Hz, 500 Watts | 120V, 60Hz, 500 Watts |
| Amps | 4.2 amps | 4.2 amps | 4.2 amps |
| Weight | Under 8 lbs | Under 8 lbs | Under 8 lbs |
| Never Loses Suction Technology | Yes | Yes | Yes |
| Motorized Brushroll | Ye | Yes | Yes |
| Brushroll On/Off | No Brush roll will always spin, but spin slowly when set to clean bare floor and area rug. | No Brush roll will always spin, but spin slowly when set to clean bare floor and area rug. | No Brush roll will always spin, but spin slowly when set to clean bare floor and area rug. |
| Washable Filters | Yes | Yes | Yes |
| LED lights | Yes in floor nozzle and hand vac. | Yes in floor nozzle and hand vac. | Yes in floor nozzle and hand vac. |
| Wall Mount | Yes | Yes | Yes |
| Anti-Allergen Complete Seal Technology | No | No | No |
| Bottom-empty dust cup | Yes | Yes | Yes |
| Attachments | a Crevice tool, Dusting brush, Pet Hair Tool, Dust-Away, Microfiber Pad, and Wall Mount | a Crevice Tool, Dusting Brush, Pet hair Tool, Hard Floor Genie with microfiber pad and on-board storage clip. Accessories Bag, Wall Mount | a Crevice Tool, Dusting Brush, Pet hair Tool, Hard Floor Genie with microfiber pad, on-board storage clip, TruePet Motorized Brush. Accessories Bag, Wall Mount |
| Tool Clip | No | Yes | Yes |
| Ergonomic Handle | Yes | Yes | Yes |
| Cleaning Wand | Yes | Yes | Yes |
| Speed options | 2 Speed Brushroll | 2 Speed Brushroll | 2 Speed Brushroll |
| Advanced Steering | Yes | Yes | Yes |
| Color | Green | Lavender | Burgundy |
| Self-propelled | No | No | No |
| Full Bin Indicator | No | No | No |
| Surface Cleaning Types | Carpet, Bare Floors | Carpet, Bare Floors | Carpet, Bare Floors |
| Warranty | 5 year limited warranty | 5 year limited warranty | 5 year limited warranty |
| Manual | Download Manual | Download Manual | Download Manual |
| Dimensions | 47.5" high x 10.25" wide x 12.375" deep | 47.5" high x 10.25" wide x 13" deep | 47.5" high x 10.25" wide x 13" deep |
If you know other difference between Shark HV310 and HV321, HV322, please share below with others.
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