Pixologic Zbrush Core Mini [best] ★ Deluxe
Use Core Mini for organic characters. For mechanical parts (gears, hinges) use Tinkercad or Fusion 360.
But for the average hobbyist, student, or curious painter, ZBrush has always had a few intimidating barriers to entry: a high price tag ($895+), a notoriously "weird" UI, and a learning curve steeper than a cliff face. pixologic zbrush core mini