Quick takeaway
Dyson V12 Detect Slim Cordless and Electrolux EFC71612 Pure F9 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 its current price, brand, or design fits your shortlist better than Electrolux EFC71612 Pure F9. It currently costs about $450.00 more, so make sure those wins matter to you.
Choose Electrolux EFC71612 Pure F9 if...
Pick Electrolux EFC71612 Pure F9 if its current price, brand, or design fits your shortlist better than Dyson V12 Detect Slim Cordless.