What is the difference between DC33 and DC28? Which works better? Read comparison here.
In this post, DC33 refers to DC33 Multi Floor, DC28 refers to DC28 Animal.

Dyson DC33 VS DC28 Compare
images from manufacturer

Airmuscle Technology
DC28 featured Dyson’s Airmuscle Technology which was claimed to clean floors thoroughly, there are some users said that this feature did make a difference; whereas DC33 didn’t have this feature.

Suction Power
Slightly different.
DC33 has a suction power of 240 air watts while DC28 has 245 air watts.

Brushbar Control Type
It is easier to control the brushbar of DC28.
The control of the brush bar of DC33 is located on the head, when you want to turn it on/off, you have to bend down to do this; whereas no bending down needed when using the DC28, because it uses fingertip brush control.

Tools
DC28 comes with a stair tool, combination accessory tool, flat out head, and mini turbine head; whereas DC33 comes with a combination accessory tool and stair tool.

Weight
DC33 is lighter.
DC33 weighs 17.6 lbs while DC28 weighs 20.61 lbs.

Cord Length
Slight difference, they both have a long cord.
DC33 has a 35 ft cord whereas DC28 has a cord length of 35.2 ft.

Size
The dimensions of DC33 are 44.9″ x 13.4″ x 14.0″ while the dimensions of DC28 are 42.1″ x 13.5″ x 14.3″ (H x W x D).

Price
DC33 is cheaper.
At Dyson.com, DC33 is priced at $399.99 while DC28 costs $599.99 on 2011-08-18.

Both of these Dyson upright vacuum cleaners use fixed wheel, not Ball technology; they also feature Root Cyclone technology; have 12 amp motor, 0.61 gallon dust bin, telescope reach wand, lifetime washable HEPA filters, and carry five years warranty.