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the sculpting performance is about the same for me but modo sculpting works a bit differently. it's image based
Actually, this is not quite correct. Nodo has three different sculpting modes. One is mesh based and the other two are image based. The mesh based sculpting cannot come close to pushing the number of polygons that a program like ZBrush does in its hybrid environment. So mesh-based sculpting in modo is mainly for making larger sculpts and not fine details. The two image based sculpting modes are for fine details and use what are called micro-polygons for details. Image based sculpting is slow for large sculpts and so mesh-based works best for that. Mesh-based is slow for fine details (because you would have to have zillions of polygons for this) and so image-based is best.
However, you can use mesh-based to affect the mesh and convert image-based sculpts to displacement maps via baking.
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