Buy the Kitsch Scalp Massager.

Two silicone brushes do the same job in the shower, and one of them costs a third of the price.

What was compared

1. A third of the price for the same job
Kitsch runs $5.99, Briogeo runs $18.00, for devices doing the identical thing: silicone bristles working your scalp in the shower. Unless the Briogeo name on the handle matters to you, that extra $12 buys nothing the Kitsch does not already do.
2. 10,000 people bought this last month
Kitsch moved 10K+ units in a month with 2,971 ratings behind it. Briogeo sold 100+ with 521 ratings. That is proof at a scale Briogeo has not come close to matching.
3. Works wet or dry, same as the pricier one
Both are flexible bristle brushes built for wet or dry hair and shampoo lather, so Briogeo is not doing anything scalp-wise that Kitsch cannot. The extra cost buys brand polish, not extra stimulation.
4. Pairs with a shampoo line you may not own
Briogeo pitches this massager to work alongside its own Scalp Revival shampoo and conditioner system. Unless you already buy Briogeo haircare, that pairing never shows up for you, and you are just paying more for a brush.
5. Yes it is rated higher. Not enough to matter.
Briogeo sits at 4.4 stars against Kitsch's 4.0, but that score comes from 521 reviews versus Kitsch's 2,971, a far thinner sample. A 0.4 star gap on a $5.99 impulse buy does not justify tripling the price.