Comparison
Dyson V15 vs Dyson V12
The V15 is the heavier, more powerful machine; the V12 is the lighter one most people would actually enjoy using. Deciding between them is less about specifications and more about your floors, your home's size, and whether anyone in the house has allergies.
The short answer
For most flats and mixed hard floors, the V12 is the better buy — lighter, cheaper, and enough suction. Choose the V15 for larger homes, thick carpet, or shedding pets.
Weight is the feature nobody weighs
Cordless vacuums are held up, not pushed along. A few hundred grams changes how far you get before your arm gives up, and it is the most common thing owners mention months into ownership. The V12 is the noticeably lighter machine and the one people reach for more often.
A vacuum you use weekly beats a stronger one you avoid. If nobody in the household has a specific reason to need maximum suction, weight should decide this.
Suction and floor type
On hard floors and low-pile rugs, both clean well and the difference is hard to notice. On thick carpet and with pet hair, the more powerful machine earns its keep: fewer passes, less re-running the same strip.
If your home is mostly hard floor, spending up for the more powerful model buys capability you will rarely use.
Run time and battery
Quoted run times assume the lowest power setting with a non-motorised tool. In real use with a floor head, expect substantially less, and far less again in boost mode. For larger homes, a removable battery — or a second one — matters more than the headline figure.
Batteries are the usual failure point on cordless vacuums after a few years. Before buying either, confirm that a replacement battery for that specific model is available and what it costs; it decides whether the machine lasts three years or eight.
Filtration and allergies
Both are sealed systems with washable filters. If someone in the home has asthma or a dust allergy, filtration and bin-emptying design matter more than suction numbers — emptying a bin badly undoes a good filter.
Wash filters on the schedule in the manual. Reduced suction on these machines is far more often a clogged filter than a failing motor.
Price and accessories
Dyson sells many near-identical variants that differ mainly by which heads are in the box. Compare the bundle, not just the model name: an extra head you actually need can be worth more than a step up in model tier.
These machines discount regularly. Buying at launch price is rarely necessary.
Which one should you buy?
Choose the V12 if
You live in a flat or mid-size home with mostly hard floors and want something light enough to use often.
Choose the V15 if
You have a larger home, thick carpet, or pets that shed, and you will genuinely use the extra power.
Choose neither if
You want a single main vacuum for a large carpeted house. A corded upright still cleans deeper for less money; cordless is best as the machine you grab daily.
Check today's price and verdict
This page covers the durable differences. For current prices, stock in your country and recent owner complaints, run either product through WorthCheck.