There are four types of book reviews—and reviewers. It is suggested that authors benefit from garnering reviews from all of them.

Peer reviews:These are reviews by another author who writes in the same genre. If possible, these would be from a more seasoned and well-known author than yourself. 

Editorial reviews: These mostly focus on grammar, spelling, plot, structure, formatting, POV, etc. by an editing professional.

Manuscript reviews: These are overviews to help the author evaluate his/er own writing. They include those similar to the editorial review, but also delve into story consistency, character development, dialogue issues, pacing, and more.

Customer reviews:  These are from individual readers. Make it easy for consumers to post these by providing links to social media, Amazon, and so on.