The major difference between Hoover UH70102 and UH70120 is the cord winding mechanism. For the Hoover UH70102, you have to wind the cord manually, while the UH70120 features self winding cord reel, you just tap the pedal and the cord retracts.
Another difference is the Turbo Tool they include. The tool on UH70120 is a common air powered tool that use bristle while the UH70102 come with a Rubberized Pet Turbo Tool that has rubber blades to help pick up pet hair.
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Compare Hoover UH70102 and UH70120
| Hoover UH70120 WindTunnel T-Series Rewind Plus Bagless Upright Vacuum Cleaner | Hoover UH70102 T-Series™ WindTunnel® Pet Bagless Upright | |
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| Design | Upright | Upright |
| Price | $129.99 at Hoover.com on August 11, 2014 | $99.99 at Hoover.com on August 11, 2014 |
| Bagged or Bagless | Bagless | Bagless |
| Bottom-Release Bin | Yes | Yes |
| Cord Length | 25 ft | 27 ft |
| Retractable Cord | Yes | No |
| Amps | 12 Amps | 12 Amps |
| Motorized Brushroll | Yes | Yes |
| Brushroll On/Off | No no way to turn off the brush when vacuum is on | No |
| Height Adjustment Type | Manual, 5 Settings | Manual, 5 Level |
| HEPA Filtration | Yes | Yes |
| Headlight | No head light | No |
| Weight | 16.5 lbs | 15.7 lbs |
| Performance Check Indicator | Yes | Yes |
| Cyclonic Action | Dual | Dual Cyclonic Air System |
| WindTunnel Technology | WindTunnel | WindTunnel |
| Nozzle Width | 13.5" | 13.5" |
| Self-propelled | No | No |
| Handle | D-Shaped Handle | D-Shaped Handle |
| Bumper Type | Scuff Guard | Scuff Guard |
| Hose | 8' stretch hose | 8' stretch hose |
| Included Tools | Air Powered Hand Tool, Crevice Tool, Dusting Brush, Upholstery Tool | Rubberized Air Powered Hand Tool, Crevice Tool, Dusting Brush, Upholstery Tool |
| Wand | Yes | Yes |
| Wand Style | Fixed | Fixed |
| Color | Gray and Green | Purple |
| Warranty | 2 year limited warranty | 2 year limited warranty |
| Manual | download uh70120 manual |
So, no big difference except for the retractable cord.
If you like a vacuum with cord reel, then the UH70120 should meet your needs. By the way, it is a hot selling item on amazon.com. You can read reviews there before buying.