The images were the biggest tell, generating using a reference photo of a person, at least Gemini and ChatGPT have two distinct styles. ChatGPT is a little less uncanny valley than Gemini which tries to be too realistic looking, in a bad way because it tries to preserve the original person in the photo, but still can't seem to help altering facial features.

The text responses had Gemini's verbosity. Asking ChatGPT to show me iconic dishes from both Brazil and Morocco (Apple's example), is much cleaner, less verbose. Quick list of dishes and links to the recipe. Gemini just spews a wall of text and bullet points and goes on and on with fluff. Tons of "What this dish is" "Why it works" Same with its frequent use of tables, which I see less of with ChatGPT.

Each Siri demo they did in the keynote had that hallmark verbosity I typically get with Gemini without prompting it to not do that.