What's the difference between the Osprey Atmos AG and the Osprey Rook?

Both are men's Osprey backpacking packs, but the Atmos AG sits at a higher price point and is positioned as the more feature-rich suspension platform, while the Rook is the more value-oriented option. Both post a 4.8 verified-purchase average in this data set, with the Rook drawing slightly more reviews.