ACDSee is a more comprehensive tool for serious photographers, offering advanced editing and organizing features, while iPhoto is designed for casual users who prefer simplicity and integration with the Apple ecosystem.
ACDSee
Pros:
Fast image viewing and editing
Supports a wide range of file formats
Powerful batch processing capabilities
Advanced photo organizing and tagging features
Robust RAW editing tools
Cons:
Can be overwhelming for beginners
Higher cost compared to some alternatives
Some advanced features may require additional plugins