Here is the difference between Hoover UH70105 and UH70205:

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UH70205 vs UH70105
images from manufacturer

Brush ON/OFF Switch:
The UH70205 features the Brushroll Shutoff that makes it easy to transition between carpet and hard floors whereas the UH70105 does not have the brush shutoff mechanism.

Headlight:
The UH70205 has a headlight to illuminate dark spots for thorough cleaning whereas the UH70105 does not have the light.

Handle:
The handle of the UH70205 can be folded for compact storage while the handle of the UH70105 cannot be folded.

Cord Rewind:
The UH70205 equips with the cable rewind mechanism whereas the UH70105 does not.

Product Weight: the UH70205 is heavier.
UH70105 weighs 15.7 pounds, whereas the UH70205 weighs 17.8 pounds.

Price: The UH70105 is cheaper than the UH70205.
The UH70105 is priced at $99.99 whereas the UH70205 is priced at $135.99 (prices checked on June 09, 2013).

These two T-Series WindTunnel Bagless Upright vacuum cleaners have many similarities:
they are bagless;
5 level height settings that allow you to adjust as needed to clean various floors;
HEPA filter helps trap allergens;
come with Crevice Tool, Upholstery/Dusting Brush, and Powered Hand Tool to remove pet hair and dirt from furniture and upholstery;
come with 8 ft stretch hose and 12 inch extension wand for cleaning high and low areas;
feature indicator to tell when the filter needs to check or change;
an average length cord – 27 ft long;
carries limited two year warranty;
has bumper to protect furniture and furnishings;
12 amp of power to deliver adequate suction to deal with all kinds of cleaning jobs;
average 13.5 inch nozzle width;
dual cyclonic air system to provide better dirt separation and lower filter maintaining frequency.

Please share your review below if you know more difference between Hoover UH70105 and UH70205.