When comparing ImageGlass vs Microsoft Photos, the Slant community recommends ImageGlass for most people. In the question“What are the best image viewers for Windows?” ImageGlass is ranked 4th while Microsoft Photos is ranked 10th. The most important reason people chose ImageGlass is:
As long as you have enough skill you can mold it to your liking.
Question Ranking
Pros
Pro Open source
As long as you have enough skill you can mold it to your liking.
Pro It handles animated GIF files really well
Animated GIF files (let it be transparent or regular) are played seamlessly even if you zoom in and out.
Pro Portable version available
If you don't want to or you can't install ImageGlass, you can go with the portable.
Pro Pre-installed on Windows 10
For Windows 10 users, it comes preinstalled.
Cons
Con Does not support APNG
It does not support the Animated Portable Network Graphic (APNG) format yet. And it is a con worth considering.
Con Color picker doesn't have an X [close]
And can only be closed with the menu options or by ctrl+shift+k.
Con No editing options
The program lacks any kind of image manipulation or batch processing features like Irfanview or XnView has. If you're an advanced user, this will be the biggest con against this software.
Con Not cross platform
Exclusive for Windows 10.
Con Runs very slow
And sometimes cause a timeout.