When comparing Voxel vs Sproxel, the Slant community recommends Sproxel for most people. In the question“What are the best voxel editors?” Sproxel is ranked 11th while Voxel is ranked 14th. The most important reason people chose Sproxel is:
Exports to OBJ, MTL and 3MP.
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Multiple export options
Exports to OBJ, MTL and 3MP.
Pro Free, open source and cross-platform
Sproxel is a free voxel editor that's available for Window and OSX. It's licensed under the New BSD License with source code available here.
Pro Intuitive UI
Cons
Con Only for iOS
Very limited audience and use.
Con iPad only
No desktop versions are planned.
Con Abandoned
Hasn't been updated since 2012.