When comparing LightZone vs Paint.NET, the Slant community recommends Paint.NET for most people. In the question“What is the best photo editing software?” Paint.NET is ranked 12th while LightZone is ranked 21st. The most important reason people chose Paint.NET is:
Unlike most photo editing software, Paint.NET is simple to learn and easy to use. This means less time is spent learning the in's and out's of Paint.NET and more time on photo editing. For those who only edit photos sporadically and don't have time to invest in learning complicated tools for editing, Paint.Net will suit your needs.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Allows users to create and edit RAW profiles
Unlike most other RAW editors, LightZone supports user-created RAW profiles and allows editing existing RAW profiles.
Pro Allows changing the order in which adjustments are applied
You can change in what order sharpening, saturation, tone, etc adjustments are applied simply by switching around their order in the tool stack.
Pro Easy to learn and use
Unlike most photo editing software, Paint.NET is simple to learn and easy to use. This means less time is spent learning the in's and out's of Paint.NET and more time on photo editing. For those who only edit photos sporadically and don't have time to invest in learning complicated tools for editing, Paint.Net will suit your needs.
Pro Free software
There is no charge for this software; but donations are welcomed.

Pro Lightweight
Paint.net provides a streamlined but effective core tool set. Support for advanced and niche features is provided through modular plugins, allowing the user to install only what's needed.
Pro Actively developed
The project is active and being continually expanded and refined.
Pro Active and friendly community
The forums are filled with tutorials, as well as people who are friendly and eager to help.


Pro Plugins allow extra functionality
Plugins can be made by anyone in the community, and are offered for download on the forum. They extend the capabilities of Paint.NET to cover most tasks.
Pro HiDPI support
Paint.NET supports fully HiDPI displays, with no scaling problems.
Cons
Con Asset management is basic
Browser module includes a file browser, metadata viewer and a really basic metadata editor (allows editing just 6 fields), and allows you to give images a rating, but no advanced asset management is supported. There's not even a way to assign keywords to files.

Con Only available on Windows
Paint.NET is only available on Windows.
Con No project-based interface
You can only edit a single image at a time in Paint.NET. For example, in other tools you can open 5 or a 100 images at the same time, and stack those windows in all directions.
Furthermore, when you are editing in Paint.NET you can only "view" a single image at a time, even though you can have multiple images open. This limits your zooming ability, as the image will go fullscreen quite quickly, and hide parts of it behind the floating toolbars which can not be embedded anywhere on the screen.
