When comparing SLAB6 vs Voxel, the Slant community recommends Voxel for most people. In the question“What are the best voxel editors?” Voxel is ranked 14th while SLAB6 is ranked 19th. The most important reason people chose Voxel is:
Voxel's availability on iOS enables you to be creative on your iPhone or iPad anywhere you please— at the park, on the train, in a meeting. Export options make it easy to sketch out an idea on-the-go and finish it up later in Qubicle or any other desktop voxel editor supporting the .qb format.
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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 Available on iOS
Voxel's availability on iOS enables you to be creative on your iPhone or iPad anywhere you please— at the park, on the train, in a meeting. Export options make it easy to sketch out an idea on-the-go and finish it up later in Qubicle or any other desktop voxel editor supporting the .qb format.
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 Only for iOS
Very limited audience and use.
Con iPad only
No desktop versions are planned.