My Sister's Keeper vs The principles of psychology: Which Should You Read?

Both live on shelves: Psychology

Cover of My Sister's Keeper

My Sister's Keeper Jodi Picoult · 2004 ★★★★☆ 4.1 447 pages · ≈ 8 h 17 m · Moderate Find on Amazon

vs

Cover of The principles of psychology

The principles of psychology William James · 1890 ★★★★☆ 3.9 897 pages · ≈ 16 h 37 m · Demanding Find on Amazon

The verdict

Ratings are close: 4.1 vs 3.9 — either is a safe pick by score.
My Sister's Keeper is the quicker read — about 8 hours vs 16 for The principles of psychology.
My Sister's Keeper is the easier read (Moderate), The principles of psychology more demanding (Demanding).

Side by side