Maya offers Free Trial, but ZBrush does not.
ZBrush is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Maya is designed for Large Enterprises, Medium Business and Small Business.
Pricing for ZBrush Starts at $39.95/Month whereas for Maya Starts at $215/Month.
Some top alternatives to ZBrush includes Mari, 3D Slash, Strata Sculpt 3D, 3ds Max, Maya, Wings 3D, Modo, formZ and Adobe Substance 3D Painter.
Some top alternatives to Maya includes Adobe Animate, 3D Slash, SketchUp, 3ds Max, ZBrush, Cinema 4D, Modo, formZ and U-RENDER.