When comparing XnView vs Irfanview, the Slant community recommends Irfanview for most people. In the question“What are the best image viewers for Windows?” Irfanview is ranked 1st while XnView is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pro Includes simple editing tools
Typical image editing tools are included. For instance, there are tools for color and size manipulation, several filters and effects.
Pro Supports over 500 image formats
XnView speaks over 30 languages.
Pro Portable version for Windows available
Pro Available for macOS, Linux and Windows
Pro Some editing tools included (cropping, color correcting, etc...)
Pro Batch processing
Even exif information can be batch processed.
Pro Lots of plugins available
Plugins can be found here.
Pro You can just scroll with your mouse to explore images
Pro Recognizes virtually any image format
Con Free only for private use
For use in a company 1 license starts at 26 EUR.
Con UI is far from ideal
Sometimes the interface is confusing.
Con GIF viewing is buggy
GIF viewing has longstanding problems like flickering, incorrect framerate or artifacts, and it is very unlikely that it will be ever fixed.