I've only looked at "Computer Architecture", but I have "Computer Organization and Design". I thought the CA book was too technical and complex for me, but I loved Computer Org and Design.

Design and understanding of the computer system as a whole unit. Performance Evaluation and its role in computer system design; Instruction Set Architecture design, Datapath design and optimizations ...

Design and understanding of the computer system as a whole unit. Performance Evaluation and its role in computer system design; Instruction Set Architecture design, Datapath design and optimizations ...