When comparing XnView vs qimgv, the Slant community recommends qimgv for most people. In the question“What are the best FOSS image viewers for UNIX-like systems?” qimgv is ranked 1st while XnView is ranked 5th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Supports over 500 image formats
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 Available for macOS, Linux and Windows
Pro Easy redate and view configuration
Pro Compare images side-by-side
To delete blurry phone pics, etc.
Pro Multi-lingual
XnView speaks over 30 languages.
Pro Portable version for Windows available
Pro Simple UI
Pro Fast and lightweight
Pro Can support video playback
Experimental feature via libmpv.
Pro Customizable shortcuts
Can use a variety of short-cuts which can be customized.
Pro Beautiful
Pro Open-Source/Libre
Pro Supports Linux and Windows
Pro Ability to run shell scripts
Pro Plugin support
Can extend/add features by downloading or writing your own plugins.
Cons
Con Very poor quality and very invazive on windows 10
Convert all images to 8bit rgb
[not suport 16bit or 32bit, cmyk, Lab, multichannel] so you never be able to see real original image, you only see the result of conversion...on windows 10 it enforced self promotion to default app for every type/format of image...
Con No Dark mode
Con No custom installation - if you need i.e. a language package, you need to install the full version
Con Free only for private use
For use in a company 1 license starts at 26 EUR.
Con Doesn't show movies on phone in correct position
Some of mp4 files shows in upside down position.