When comparing PaintCAD 4Windows vs Krita, the Slant community recommends Krita for most people. In the question“What are the best pixel art / sprite editors?” Krita is ranked 3rd while PaintCAD 4Windows is ranked 28th. The most important reason people chose Krita is:
All the most used and useful tools are easy to find in Krita's UI and are often just one click away. They are not hidden behind menus or dropdowns.
Specs
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Pros
Pro Doesn't need to be installed
Simply download package, unpack, and use: no installation/setup/registry are required. Furthermore, all settings are saved in its own folder.
Pro You can draw images using the keyboard alone
The cursor on the image allows you to move it to any pixel of your image and place colored pixels precisely. You can draw on a small notebook (when travelling on a train or bus, for example), or in any other situation where you don't have access to a mouse.
Pro Completely free to use
All the user has to do is download the software and put it to use: draw images, create animations (gif), videos (avi), tilemaps, draw raster PCF fonts, and use it on your images for free!
Pro Support for Russian and English
The interface and help system have two localizations (English and Russian) included in the distributive package.
Pro Works with every Windows version
PaintCAD 4Windows doesn't need any .net, java, or other VM installed: it is a pure Windows 32-bit application and will work on every Windows-based operating system starting from Windows 95 until Windows 10.
Pro Easy to use layout
All the most used and useful tools are easy to find in Krita's UI and are often just one click away. They are not hidden behind menus or dropdowns.
Pro Constantly updated
Krita is getting constant releases with updates and bug fixes. New features are added at a pace that far surpasses the other alternatives.
Pro Free and open source
Krita is completely free and open source. They have raised a couple of successful Kickstarters in the past to get the initial financing and now they are accepting donations.
Pro Developed in part by KDE, which has a great community and therefore great support.
KDE has a long history of making solid applications.
Pro Amazing support for displaying brushes
Krita's preset brushes are one of the default dockers. Each brush has a preview on mouseover that shows a detailed view of the type of brush involved. All the brushes also have useful and descriptive names such as "HP Pencil" or "Textured Fuzzy".
Pro Very customizable
Although the UI is rather busy, Krita is very customizable. The editing window can be themed and the sidebar can be customized extensively throw many dockers or panes.
Pro Easy editing in a tiled view
Tiled view that shows your image tiled in the editor, and permits you to edit it as you are seeing it tiled. If the brush passes out of your texture, it will just automatically wrap back the painting to the other side of the original texture, while permitting you to paint and see the results on any of the tiled "clones" (the shortcut key to activate this is w by default).
Cons
Con New features are not tested thoroughly
Since releases are so often and with little time between them, usually new features are not tested a lot and this can bring a lot of bugs with them. Which fortunately are quickly patched in the next release.
Con Documentation is lacking
Krita's official documentation is incomplete in some areas, especially for new features that are constantly added. But this is compensated with it's great design and usability which makes it easier to understand how things work.
Con Poor touch controls
They are still pretty much a WIP. But they are getting there.