Which is better from a Controls perspective, a Stepper or Servo Motor?
First off, servos and steppers both have pros and cons and tend to have slightly different use cases. This means that, in your case, it comes down to personal opinion (this is more of a yes/no, go/no go site)

Having said that. Steppers can be simpler to drive and can hold their position with no power (although their holding torque is much better with power in which case they're no better than servos), but have limited top speeds and tend to be a bit jittery - i.e. they don't have really smooth flowing movement (they're called STEPers for a reason). Servos can be really fast (1000's of rpm) but good ones can be quite pricey due to a much more complex control system, although good quality servos can have very fluid motion. But this depends on whether you mean RC servos or real proper AC Servomotors.

It's not that one is inherently better than the other, they're just different (like left and right hand drive). RC servos and un-encoder-ed steppers being more or less on par in terms of practicality.

As it sounds like this is a rough 'n' ready project, the distinction is likely a non-issue in your case, so it's going to come down to what you feel is appropriate, go with what you know works for as we engineers say: "Go with what you know" as "Good enough is almost always good enough"