Heard this question in a podcast, and it put a LOT of things in perspective for me.
And for those of you wondering what the difference is, a customer is considered to be a quick transaction (e.g., you selling them a physical product).
And typically the sale would happen without you having to be present. One & done.
A client is someone who will need your skillset & attention for a longer period of time (e.g., a 3-month project). And typically, the payment comes as you hit milestones within the completion of the project.
So - which do you prefer?