I casually began looking into 3d sculpting a while ago and ended up listening something a pro artist said on this topic. This was him comparing zbrush and blender, mind you, so he wasn't talking about the medium in general. But he said that while there are some areas where zbrush might be better, blender is at the least perfectly adequate. Biggest advantage of blender is that by virtue of it being free it has the most community resources (tutorials, documentation, forums, etc.). Moreover, the fundamentals of sculpting translate between different software. So he highly recommended blender for newcomers between the two.

It also seemed like you really need something like a graphic tablet if you wanna do it somewhat seriously.