Kenmore 21714 vs 21514
images from manufacturer

All comparison info is based on product pages at kenmore.com and product manuals.

Color:
The 21514 is white while the Kenmore 21714 is red.

Price: The 21514 is over $100 cheaper.
The Kenmore 21514 is priced at $229.99 on kenmore.com while the Kenmore 21714 is priced at $339.99 on 2013-04-25.

Wand:
The Kenmore 21514 uses a standard wand that has a upper wand and a lower wand, while the 21714 uses a telescopic wand.

Cord Length:
On the Kenmore.com product pages, it states the cord length of of Kenmore 21514 is 26 ft while 21714 has a cord length of 28 ft.

Dirt Sensor:
The Kenmore 21714 has dirt sensor to help locate dirt while the 21514 doesn’t.

Swivel Steering:
They have different powermate. The 21714 powermate nozzle has Swivel Steering feature that helps you clean around corners and furniture easier while the 21514 doesn’t.

Hose Length:
On the product pages at Kenmore.com, it states that Kenmore 21514 has a 6 ft hose while the hose length of 21714 is 8 ft.

Filter Type:
On the product page, it states that Kenmore 21514 uses Micro Filtration while the 21514 uses HEPA filter type.