Dyson Supersonic vs Shark SpeedStyle Pro Flex HD542

The Dyson Supersonic and Shark SpeedStyle Pro Flex HD542 represent two different engineering trade-offs in the premium hair dryer category. The Shark is lighter at 712g versus the Dyson's 816g and delivers more wattage at 1,750W versus 1,600W — two advantages that matter most for thick, long hair that requires sustained airflow. The Dyson counters with a longer 9 ft cord versus 8 ft, a larger attachment set of five pieces versus four, and a published noise level of 77 dBA that gives it a quantifiable edge in quiet operation. Both dryers offer four heat settings, three speed settings, ionic technology, and cool shot — making those specs a wash.

The Dyson Supersonic's primary strength is its attachment ecosystem. The five included accessories cover a wider range of hair types and styling tasks than any competing dryer at this tier: the Diffuser preserves curl definition, the Flyaway attachment uses a weak ionic charge to smooth flyaways without heat, the Styling concentrator directs airflow with precision, the Wide-tooth comb detangles during drying, and the Gentle air attachment works safely on fine or fragile hair. The Dyson digital motor V9 runs at 77 dBA — quieter than most 1,600W motors — and uses intelligent heat control to prevent extreme temperature spikes that cause heat damage over time. The 9 ft cord is a practical advantage in bathrooms where the outlet is not adjacent to the mirror.

The Shark SpeedStyle Pro Flex's case rests on two concrete specs: weight and wattage. At 712g it is 104g lighter than the Supersonic, and on hair dryers used for 10–20 minutes per session, that difference is felt in the wrist and shoulder. The 1,750W motor moves more air volume per second, which shortens overall drying time on thick or long hair — the scenario where dryer performance matters most. The four included attachments are purpose-designed for frizz control: the QuickSmooth Brush combines a brush and concentrator in one head, and the FrizzFighter Finishing Tool seals the cuticle after drying. These are functional finishing tools, not basic styling accessories.

If you have thick or long hair that takes more than 15 minutes to dry, the SpeedStyle Pro Flex's 1,750W output and lighter 712g body reduce total session fatigue. You will dry faster and hold less weight. If your hair is fine, damaged, or curl-prone — or if you regularly switch between diffusing, smoothing, and finishing — the Dyson's five-attachment set handles more styling scenarios without additional purchases. The 9 ft cord is meaningful if your bathroom layout keeps you more than 7 feet from the outlet.

The decision maps cleanly to hair type and use pattern. Choose the Dyson Supersonic if you have fine, damaged, or curly hair where attachment variety and gentle airflow matter more than raw wattage, or if noise level is a real constraint in your household. Choose the Shark SpeedStyle Pro Flex HD542 if you have thick or long hair where faster bulk drying and a lighter body are the priority, and the four purpose-built frizz-control attachments cover your styling needs. Both carry a two-year warranty and include ionic technology — neither advantage applies to the warranty or ionization comparison.