I think it's more of a contextual situation. Assuming you're actually presenting it to them either in-person or via video chat/screenshare, you get to see how they react to something they requested that you create for them, opposed to something you created in the past for someone else. Ideally they give you good constructive feedback, but maybe they don't and are irrational and emotional about their feedback.
I only ask because the only time I've ever received useful valuable feedback on work I've done has been on work done for someone else (which makes sense, it's the work I was able to genuinely prioritize and think about as well as work on in a real environment instead of a hypothetical vacuum).
I think it's more of a contextual situation. Assuming you're actually presenting it to them either in-person or via video chat/screenshare, you get to see how they react to something they requested that you create for them, opposed to something you created in the past for someone else. Ideally they give you good constructive feedback, but maybe they don't and are irrational and emotional about their feedback.