Very hard to say for me. I did use AutoCAD, but it was years ago. I’m talking more than two decades (AutoCAD was first released in the early 80s), so impossible to judge the current state of the software now.

I can say FreeCAD is good for 3D printing stuff. I also like OpenSCAD, a 3D scripting language.

I wrote a 4 part tutorial series that takes you from designing to printing and covered both FreeCAD and OpenSCAD from a beginner’s perspective, if you are interested:

Part 1: OpenSCAD

Part 2: More OpenSCAD

Part 3: FreeCAD

Part 4: Slicing and printing