Buy the Biolage Scalp Sync Anti-Dandruff Shampoo.

It costs less per ounce, reviewers trust it to actually calm a flaky scalp, and unlike Dove, you can actually buy it right now.

What was compared

1. You can actually buy it
Dove Damage Therapy is listed as Currently unavailable with no restock date. Biolage ships free with Prime, arriving tomorrow. A shampoo sitting out of stock is not a real competitor no matter how good its reviews are.
2. Costs you less every single wash
Biolage runs about $2.00 an ounce. Dove works out to roughly $3.08 an ounce at $37 for 12oz. Same active ingredient, pyrithione zinc, but Biolage gets you there for noticeably less over months of regular washing.
3. Clean scalp, not a dry flaky one
Reviewers describe Dove's reformulated Damage Therapy leaving their scalp dry and flaky, the exact problem it claims to fix. Biolage reviewers consistently report a clean, dandruff-free scalp wash after wash with no such complaints.
4. A treatment, not just a scented rinse
Biolage users leave it on 5 to 10 minutes for real dandruff treatment, built as a dedicated scalp formula. Dove is a general moisturizing 2in1 shampoo where dandruff control is a bolted-on claim, not the main job.
5. Dove's rating looks better. It is not the full story.
Dove shows 4.6 stars across 8,522 ratings against Biolage's 4.2 from 132, a real gap on paper. But Dove's own buyers report dryness and reformulation complaints, and right now it is out of stock, so that score cannot help you today.