Which is better for pet hair?

The Shark, on paper. It has two brushrolls for hair pickup and is listed for pets, and the Dreame lists no comparable brushroll or pet spec.

Which has the bigger dust bin?

The Dreame Z20, if the 0.79 gal option is the one you buy. The Shark holds 0.19 gal and the Dreame's base bin is 0.16 gal.

Is the Shark worth the price swing?

At the $159.66 low it is the better value of the two. Near $329.95 it costs more than the Dreame's $239.99 low, so the store price on the day decides it.

Which is better for allergies?

The Shark. It has a sealed HEPA filter; the Dreame's listing states no HEPA filtration.

Which is lighter to carry upstairs?

The Shark, at 7 lb. Dreame does not state a weight for the Z20.

How long does each run on a charge?

The Shark is rated up to 70 minutes, with 60 minutes listed on one store page. Dreame does not state runtime for the Z20.

Shark PowerDetect Speed Cordless Stick Vacuum vs Dreame Z20 Cordless Stick Vacuum

Buy the Shark PowerDetect Speed if you want HEPA filtration, pet hair pickup and a lighter 7 lb body at the lower price. Buy the Dreame Z20 if you want a bigger bin and are willing to pay more for it. The Shark has been seen at $159.66 on November 1 and $329.95 on November 3; the Dreame has been seen at $239.99 on November 2 and $297.39 on November 4. The Shark's price swings widely, so check the current store price before you commit.

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