Decide Whether to Read the Book or Watch the Adaptation First

Book or adaptation first is not a trivial question: the order changes what you notice, what you miss, and how you feel about both. Reading the book first often makes the adaptation feel like a reduction. Watching first sometimes makes the book feel slow. The answer depends on what you care about and what the two versions actually differ on. This works it out for you.

I want to experience a story that exists as both a book and a screen adaptation. Help me decide which to do first.

The book and adaptation in question: {TITLE}
What I care about most in a story: [describe what you prioritise, for example prose style, plot, character depth, atmosphere, pacing, visuals]
Any constraints: [describe anything relevant, for example how much reading time you have, whether you have already seen part of one]

Tell me: what is meaningfully different between the two versions, which order benefits my stated preferences, and what I lose and gain whichever direction I choose. Give me a clear recommendation rather than a balanced non-answer.