The answer to this question depends on your hair type. Thin or fine hair benefit from a ceramic hair dryer because it heats quickly and creates even heat distribution. However, an ionic model zaps these hair types of much-needed volume.
On the other hand, someone with thick curly hair can definitely appreciate the smoothing properties of ion technology. If your main goal is to tame flyaways and maintain curl definition, ion technology is a better bet. For the best of both worlds, look for a ceramic model with controllable ion technology.