When comparing SLAB6 vs 3D-Coat, the Slant community recommends 3D-Coat for most people. In the question“What are the best voxel editors?” 3D-Coat is ranked 5th while SLAB6 is ranked 19th. The most important reason people chose 3D-Coat is:
3D coat is also known in the game industry to be a great app to preform retopology.
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Pros
Pro idTech1 and Build engine voxel editor
While the idTech engine 1 (aka the "DooM Engine") does not support voxels, newer limit-breaking source ports have added the ability to render the .kvx voxel format designed for the Build Engine. Slab6 is currently the only well-known .kvx editor as it continues to pop up in DooM modding forums and tutorials. Even though it's not the most user-friendly editor, its support for .vox export enables the model to be edited in MagicaVoxel or voxels made in MagicaVoxel (which supports Slab6 (Slab) .vox export) to be converted to .kvx for use in-game.
Pro A known app for retopology
3D coat is also known in the game industry to be a great app to preform retopology.
Pro Link to Photoshop, or any app that can open PSD files
You can save and open your texture work in apps like Photoshop, work on them and send them directly back to 3D coat. It will remember your layers and update.
Pro Professionals recommend 3D Coat for Handpainted textures
You can texture in many styles with this app, but when it comes to Handpainting, as seen in World of Warcraft and Torchlight, 3D Coat is the one that many professionals will advice you to as their top choice.
Pro PBR materials
3D Coat supports the creation of your own PBR materials that are ready to be used in the PBR workflow.
Pro Voxel sculpting
Voxel sculpting is entirely free from the bounds of polygons and topology.
Pro A fast and fun way to UV
3D coat has made UVing my work go super fast and it's actually quite fun because you're finished in a breeze.
Cons
Con Not very user friendly
If I asked most people to use this to draw something without reading anything about the program, a good percent would not be able to. with odd controls like 'Insert' to draw, 'L' to open, and no customization on these controls, its requires users to read how to use it. the help guide only gives you a basic understanding of how things work and requires you to search through files in order to fully understand how powerful this tool really is. If i were to rate this for how user friendly it is on a 1 -10 scale (with 1 being like binary switch panels, 3 being ms-dos, 5 being a minimal gui with a complex console command line for all functions, 8 being able to sit down and perform basic operations, and ten being no effort at all,) I would give this a 7(has a gui that is easier to navigate but even simple functions require a bit of reading).
Con Not a voxel program
This is a paid texture program. Why is it in this list?
Con Voxel sculpting hits your system
Voxel is quite heavy on your computer, if you intent to use this as your main model and sculpt app do enough research to see if your computer can handle it and if you have the right graphic card for it. If you really have doubts , just go ask in the forums.
Con 7 layer restriction in the affordable version
The cheapest version available only lets you paint on 7 layers, which is very unfortunate.