Like other questions in the same vein, it doesn’t matter what software package you use as long as you understand the principles behind it. It’s just a tool to an end. Think about traditional sculptors. Some use clay, some use marble. There might be some workflow differences, but understanding form and anatomy is never going to change. Blender has a very comparable sculpting toolset, although quirky when compared to Zbrush. By quirky I mean the Refine Method and Detailing can affect your sculpt whereas in Zbrush is feels a little more intuitive to traditional sculpting.
I learned Maya first. Just because I learned Maya first doesn’t mean I don’t know how to model. After working with Blender for a few years now, I’ve made many things I can also make in Maya. Take Blender for a whirl. Heck, why not MudBox, too, if you can get if for free. Maybe you’ll like one over the other. What this winds down to is it doesn’t matter what tool you use as long as you understand the fundamentals.
