The main difference between Revlon and Drybar's brushes seems to be the price. The Revlon brush is $60 on the company's website, but is available for as low as $35 at places like Bed Bath & Beyond. Meanwhile, the Drybar version is over double the price of the Revlon one at $150. 

Shay Shull, who runs a lifestyle blog called Mix & Match Mama, found that the Revlon brush pulled out slightly more hair than the Drybar version, and noted that some of her followers complained that the Revlon's temperature was too high. Therefore, if you have thinning or damaged hair, you might benefit from investing in the Drybar version as it tends to pull less hair and has more customizable temperature settings. But for Shull, she liked the larger size of the Revlon brush as it helps dry longer hair faster. Plus, she believes that the Revlon version offers similar end results for a cheaper price — a great deal for a first-timer.

Similarly, YouTuber Risa Does Makeup (above, holding the Revlon round brush) found that the Drybar brush took longer to dry her hair than the Revlon. While Parade claimed that the Revlon brush was louder than the Drybar, Risa turned both of the brushes on during the video and found that both were equally loud. She felt the Revlon brush made her hair smoother, while she saw more frizz and flyaways on the side she used the Drybar version. 

It certainly looks like there's a clear winner here.