You can use the Photos app to view or edit photos and videos in your Pictures library and on OneDrive, and to import photos and videos. The Photos app includes a wide range of editing options to enhance your photos, from automatic fixes to advanced adjustments. Share photos and videos without leaving the app.
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Pros
Pro Pre-installed on Windows 10
For Windows 10 users, it comes preinstalled.
Cons
Con Bloated as Windows 10
Windows Photo Viewer takes almost 30 seconds to open in a high end computer. That's embarrassing.
Con Runs very slow
And sometimes cause a timeout.
Con Integration with Microsoft services = No privacy
For example, it uses AI-powered facial recognition features and integrations with Cortana.
Con Auto improves RAW files that can't be turned off
And it is TERRIBLE!!!!
Con It lacks of tools for designers
The other image viewers have much more tools than this app...
Con Not cross platform
Exclusive for Windows 10.
Con Written in C# and XAML
Windows 10 UWP software tend to perform worse than software written in C++.