Quick takeaway
Dyson V12 Detect Slim Cordless and Shark Vertex Pro Cordless DuoClean are very close in this matchup. When the overall score is tied, the right choice usually comes down to price, review depth, and which spec wins matter most for your use case.
Choose Dyson V12 Detect Slim Cordless if...
Pick Dyson V12 Detect Slim Cordless if battery life and weight are the reasons you are shopping in this category. It currently costs about $400.00 more, so make sure those wins matter to you.
Choose Shark Vertex Pro Cordless DuoClean if...
Pick Shark Vertex Pro Cordless DuoClean if its current price, brand, or design fits your shortlist better than Dyson V12 Detect Slim Cordless.