Servo vs Stepper Motor


I'm working on a traverse mechanism that only requires to lift and lower a pitot tube (very lightweight) for an experiment. Speed is of no importance, I only want precision and accuracy. It's an inexpensive project, so I was considering using a motor and belt pulley system to move up and down. The distance is at most 12 inches. My question is, is it better to use a stepper or a servo? The only advantage I'm seeing for the servo is that it doesn't require calibration for its zero, but its more expensive. Which one do you think is best for the application?

What sort of servo are you considering which is more expensive than a stepper motor and stepper motor driver?

A diagram of the mechanism you are planning to make would be a big help. See this Simple Image Guide

Stepper Motor Basics
Simple Stepper Code

This has already been discussed pretty thoroughly in your original thread:

My comment in that thread wasn't meant as a recommendation to cross post.